I would like to know how are you recording the guitars, was recorded everything together? mic or DI? which mic?
I use a SM57 for guitars and what I usually do is a low cut around the 62 Hz, then cut a couple of db at the 2k Khz - 4 Khz to leave some space for vocals. Then depending of the kind of song at the 8 Khz - 16 Khz I boost it or cut it, like i said, depending on the song.
I don't trust to much in that auto Attach/Release, for drums i like to use a medium low attach (this won't kill the dynamics) and a medium release. But first check the levels, cymbals, toms, kick, snare, etc. To much different dynamics on them? then edit the levels one by one (yeah, it sucks, but it will worth the time) to adjust the levels, then compress.
Good Luck!