Here are some tips for you, when laying down MIDI Drum Tracks:
1. Think beyond one track and either record each drum (mainly Bass, Snare and Cymbals) on a separate track, or cut and paste each voice from the Drum track to separate tracks. This will allow for complete and independent control over each voice. It will not only give you control over levels but will allow you to shape the sound of each drum into one that is unique to you.
2. Layer MIDI drums with real sampled sound. Until you get comfortable with sampling and triggering real drum sounds, start with layering real crash cymbal samples over the drum part. Most would argue that a digital recreation of a cymbal is the most difficult and therefore the easiest to catch with our ears. Using real cymbal samples brings a very nice sounding element to programmed drums.