Hey Derj,
You should grab up this month's issue of Computer music (Auguest 2008), sub focus goes through how he makes his drumlines and gives some useful tips about the bass drum, too much bass drum at the lower frequencies and you begin to squash the room for the bassline, the kick should usually be higher at a higher frequency than what you set the bass at, to leave room for your bass. It's really useful and it helped me get more sound out of my entire track by adjust the drums a bit. Also there's a shitload of dnb samples to check out on the dvd that comes with it as well. Another useful tip is to listen to your favorite stuff and constantly compare your stuff to the tracks you listen to, it may be a bit discouraging at first but you sometimes have to struggle before you get anything accomplished.
Werd,
M. Progression