Hey Beeps,
Sorry for showing up so late. Rough couple of days for me...
Anyway, bass is a hard instrument as you know. However, it's only hard when you:
1. Don't have the right monitors/sub
2. Don't have the right gear
3. Don't know how much bass should be in a bass for a particular situation.
Not knowing anything about this duoverb amp, I can't tell you whether or not it's cutting anything out. I would assume it probably is due to guitar amps being made for guitars...but you never know.
I'd not rely too much on any of the graphs you may be using. The reason being....sometimes the graphs look terrible but actually don't sound as bad as they look. I only look at a graph when something is wrong and I can't take it out on my own. I can usually sweep through and find something in an instant...but when I can't seem to hone in on a problem area, the graph can definitely help me out. Other than that, I never look at the things.
Typically, the best way to set up our bass sound is to make a decision on how your kick and bass relationship are going to be. Meaning, if you want a boomier kick drum, you'll be more successful if you have a bass with less low end in it with a bit more clack to it. When you want a kick with more beater click in it, then you can allow more low end in your bass guitar. This is a sure fire way to make sure your kick and bass never fight with each other. Then again it depends on what you're going for. The classic rock days pretty much had their kicks and basses closer together frequency wise. Both were boomy with little to no higher end transient attack.
You CAN still get that sound easy enough....the key is to not boost the same frequencies or you end up with frequency masking. But me personally, I usually like a low kick with a little beater attack where my bass will have a bit more of a percussive clack at around 1.5k-2.5k....or a kick with a bit more beater attack and less low end so the bass low end can be more dominant.
The trick here is....you have to decide what frequencies these instruments sound the best at. For example, in one tune, you may get lucky with the low end of a bass being roughly at about 80 Hz like you have now. High pass it until that stuff you are seeing at around 40 Hz is gone. You'll know if you pulled too much out. But experiment with your high passing allowing more low end. Then set it tighter NOT allowing more low end and try turning up the fader. One of the biggest mistakes people make is....they substitute just turning up the fader of a bass with less low end, with a bass with with a lower fader and louder sub lows. If you can feel your bass more than you can literally hear it, you have too much low end. Now in your monitor situation with cans...this may be difficult to hear correctly. But you want to always hear the bass more than you feel it unless you have a specific reason to rattle your bile ducts. LOL!
Now, if the bass is all tightened up and you're mostly hearing it in or around the 80 Hz range as you lowest point, you might want to get a kick drum that would sound good from the 55-70 Hz range. See, the problem most people have is...they just get a kick drum they like and try to push those frequencies....that's not how it works. You literally have to find a sound that sounds right pushing those types of lows or it's not going to sound right.
Now let's flip it around. You may decide you want a kick drum that kicks in the 75-90 Hz range which are good places too...but it depends on the kick you choose. This is where a Bonham kick would be. Say you find one like that....for your bass guitar you might want to try your low and push from 50 Hz to 65 Hz or so. You have to be careful with low end under 60 though....because if you over-do it, your mix will go south really fast due to the rumble. 60 to 80 can give you low end mud...you have to use it sparingly. Most of the basses *I* record...never need to be boosted in those areas. I take a Sonitus EQ or use the PC EQ and just high pass the frequency that will be my main low end freq, and let it in a little at a time until I have just enough low end body. As soon as I feel it, I'm using too much. Remember, bass in a recording has less low end in it than you think. Especially in the older metal stuff we listen to.
Try to dig up some cool recordings that you like and find spots where the bass is all alone. Though it's been mastered...you can still get a rough idea as to how little low end really is in a bass. In today's newer music, they are pushing the sub low envelope a little too much in my opinion. It's why most of the stuff sounds bad to me....plus, I absolutely despise any bass guitars pushing out lows that have distortion on them. There's nothing worse than the sound of a low end fart all through a song that I'm trying to enjoy. I just can't accept it no matter how hard I try. I'm mixing an album with the great Uriah Duffy right now. His bass tone is so insane man.....it just slays! Like a low tuned piano! Just the right amount of ping....nice low end, brilliantly played with the right touch...it's to die for! He sent me distorted tracks for the album he's playing on and I told him "dude....I just thew up in my mouth...please please PLEASE don't ruin your sound with this crap."
We did a few mixes with the drive and without...and he saw it my way. When you play that good and have a tone that phenomenal, a little drive isn't needed. Then again, for certain things....a little sizzle on a bass is somewhat ok, but not when it needs to have nice low end on it. Uggh....I'll listen to nails on a chalkboard before a driven bass. Especially when there's already a guitar with massive amounts of drive going on. Heck, as good as John Myung is in Dream Theater...he's the one that destroys their production with that horrendous, distorted bass tone. Man, it guts me like a fish. :(
Anyway, I hope some of this stuff helps you. But unfortunately, unless I can hear what your bass is really doing, there's not much I can advise you on. I can tell you this....tonight, a client came to me with a bass track he recorded using GR 4 or 5....it was a stock preset he edited. With a little tweaking by me....I left the track alone because it sounded THAT good. That came with a version of Sonar...so if you still have it, check into it. In the mean time, I'll see if I can find the name of the preset. It was quite good. Best of luck brother.
-Danny