Harold, you'll want to make sure that bass and kick are not interfering - When deep frequency material interferes, it can sound very muddy, very quicky. Try cutting everything below 80-90 Hz on the kick drum. Also, put a sidechain compressor on the bass, chained to the kick drum so that when the kick drum kicks in, the bass will be lowered, making room for the deep frequency material of the kick. In addition, a few problematic frequencies when dealing with bass: 120-130 Hz and 300-350 Hz. Use EQ to lower these areas if they are giving you trouble. I hope that helped!
Daniel Rothmann