Also, is it a normal thing to do, to pump the main compressor on the main out, with the bass drum? For dancy type music?
I don't really like putting any FX on the amster channel, because you're not going to get good results, esp not while mixing - because any low bass you have on the tracks is going to distort and obviously alter the final mix out. You really want to apply very gentle FX on all the channels you use.
If you find your mix getting to chaotic, mute all your channels/tracks and then tweak your EQs and plugins very gently, then add another channel/track, usually start with bass, and drums together to make sure you're not overpowering, then add the next and so forth.