Hi again!
As far as panning and tracking goes... here is how I'm doing it right now. Sort of pseudo quad tracking for the heavy stuff.
I run the guitar to a direct box and split it. One line goes to an amp, which is mic'd, and the other is line in and I record just a clean sound. I can then either re-amp that clean sound(which I do sometimes but rarely), or use a guitar amp simp (something like TH3 which comes with platinum and maybe other versions too but Im not sure...but this is normally the method I take).
So in one take I end up with 2 tracks. I pop on that amp sim and dial up a sound complementary to the mic'd sound, and I pan BOTH tracks from that take the same way. Lets say left.
Then I do another take, again recording the mic'd signal and the line signal and adding a virtual amp, and pan BOTH of those from that take right.
In reality its just a double take, but I get 4 tracks out of the deal(even though I have 4 tracks it doesnt truly sound like quad tracking). I can use that amp sim track to add some flavor down the road by pinging through different amp models and seeing what really mixes well with the mic'd sound
I like this method better than actually truly quad tracking most of the time(I say most of the time because sometimes I do like quad. Just depends on what Im after). Something about actual quad tracking the same riff seems to take away focus even with a great, tight player. When that focus and tightness seems to start going away.... I find myself trying to dial in more kick drum, adding too much 3k to the guitars, and trying to bring more top end out of the bass guitar in order to get that tightness and focus back. And I'm not ashamed to admit I sometimes overdo it and have to go back and pull some of those 'corrections' back and just deal with the fact that it wont be as tight as Id like If I am to leave all 4 guitar tracks in there. This doesnt necessarily apply if we are talking about a rhythm with a complementary lead part thats playing in octaves or harmonies or something like that. At that point I could go either way(either have rhythm in one ear and the complementary lead in the other.. or just double track both and pan both left and right, ending up with 4 real tracks)
Just a quick tip. If you do quad track..., and especially if you are quad tracking the same riff, use less gain/distortion than you think you need. If the amount of gain sounds 'just right' jamming solo... once stacked 4 times it actually to my ears tends to sound like it puts a blanket over the guitars and contributes to the lack of focus. Dialing a little light makes it end up just right once you stack it multiple times.
About panning, ... for the longest time Id pan 75% left and right and call it good. Or in the case of quad tracks... Id have two tracks with a bassier sound that Id pan 70& left and right, and 2 tracks with more sizzle that Id pan 80% left and right. Real similar to what you are doing now, but just a little further with the pans. I rarely go 100% on anything. I try to make 90% my upper limit. To my ears...once things hit 100% and have no presence at all in the other speaker it seems like it takes some energy out of the track. Maybe its just mental and Im afraid of seeing the knob twisted so far but I swear I hear something that I dont like too lol
I've recently started to experiment with automating panning more. Like, I will use my double track method with the direct box that nets me 4 tracks, and using envelopes, I will set the envelope up so that one pairing of guitars are both 70% left, with the other pair being 70% right during the verse. When the pre chorus picks up I will have the envelope expand the panning on both channels to 80%, and then when the full chorus kicks in, I will set the envelope to grow it further to 90%. Sort of making the stereo image grow or shrink during bigger and smaller parts of the song. I often do the same with the drum overheads too and have them move in an out just a little from one part to the next.
I do a lot of hard rock and metal stuff too, which is not very dynamic music, and is usually pretty squashed when its all said and done. So Im using things like that to try to "create" some dynamics, in a space where there arent many, if you will.
I wont swear by that technique just yet though. Its really subtle and I think I'd need to duplicate a mix, but not automate the panning just to hear a before and after in order to say if its really 'worth it' if you know what I mean.