FYI, the correct forum would have been found here -->
http://forum.cakewalk.com/tt.aspx?forumid=9 Some good stuff has already been said. I'd mainly put it down to good use of compression and eq. If you can't get there (or at least close) without those tools, then something is wrong and re-recording certain components may be necessary. If you're using an amp sim for your sound, that's fine too, as it's an important part of your sound - but I'm talking after you have that sound.
One little point I wanted to make was to do with monitoring. Spare bedroom usually means small bedroom. A little bit of foam usually means high frequency attenuation only. As I'm sure you're aware, the end result is bad bass response. As for some personal opinion, the KRK Rokit 8's... They SOUND good. The bass on them sounds really good. For the price. But I think the bass in particular is a problem with these as far as ACCURATE MONITORING is concerned. I find the bass appears to be VERY separate from the rest of the mix. It's like there is a big hole/gap around 200-300Hz where it doesn't connect with everything else. I must admit I have only listened to these in a listening room in a store (reasonable room, set up well), but compared to other monitors, that's what I heard. This relates directly to what you are attempting to judge here. What I'm getting at is that in my opinion, your room and those monitors are going to make bass decisions very difficult. It's difficult to trust what you're hearing. Solution? Just keep in your mind to check your mix on numerous other systems and with a good set (or a few sets) of headphones. This is especially important to remember as what you hear in your room is likely to translate completely differently in another room. Just something I think is very important to keep in mind as you try out some of the above techniques. You don't want to forget it or you might waste a lot of time and then realise it works no-where else!