easy trick to avoid boomy bass is to set a narrow eq band, boost it +12db and just sweep it, until you find that nasty boomy part. now, cut it by 2-6db. keep in mind that bass guitar should be a bit boomy, but not too much. Lows and fullnes is a matter of space in the mix, if your kick is overlaping your bass then you should separate them. either make the drummer tune the kick hihger or lower or just boost/cut it. also, if guitar has too much lows, that makes also some nasty issues in the mix. guitar should have at least 90hz lowcut, so anything below that should be dead and gone.
bass and kick should be panned center, you can pan snare a bit on the side, but center is also not bad with toms you should pan them 0-50% as they are positioned. best trick for the guitar is to have two signals, and pan one 50%R and other 50%L , now ideal solution is to have different boxes on each signal path, easily done if you have a amp sim or something like that. if your guitarist uses "real amp" then you can use two mics and delay the one signal to be 1-3ms late, be carefull, they can cancel each other out, do it by the ear.
best trick to get guitar width is for one signal to be late, but it's advisable that those signals should not be carbon copies of each other. so one can be a bit more overdirven, other cleaner. you can also just duplicate clean signal of the guitar and do the same so you have 4 signals
overheads should be panned a bit harder, just like they are set on the drums, so if one cymbal is right, pan it a bit right. just don't pan things all the way. 50% is imho max if the venue is big. for smaller venues i'd go as far as 75% , also considering many other factors. panning pushes or pulls the signal in the mix. But then again, experiment from there on.
last but REALLY important thing is compression and limiters. use them! compressor should be present on every signal, not too harsh, just enough to soften the peaks. test it out
on the master track you should put compressor again, just to bite of the peaks, nothing over the top. for that "over the top" perfect spice you should use limiter. also, make sure that each signal on input doesn't go over 4-6db on normal playing, while peaks shoudn't go over 3db. after you got all of that down, it's just a matter of playing around and finding your own preferences.
last trick is to play the whole mix mono. if you can hear each instrument, then it's ok. if your guitar , overhead, vocals or something else gets audibly quieter compared to stereo mix, you did something wrong or they are canceling each other out, so try phase reverse for oposite chanel. So, for expample,guitar Left phase on if guitar is much quieter in the mono mix. If that doesn't help, then you should dial back on the pan. also, be aware that if you have two signals and one is delayed, it can cancel each outher out, especialy if paned and then mixed mono. in that case, don't panic, just slowly adjust the delay and pan.
sorry for my english.
