This is all good.

Remember also, WHERE you let the 303 kick in.. Less is more after all...

Like someone said before, the 303 sounds will occupy a lot of the audio spectrum and is relatively uncontrollable if you want to maintain the instruments intended voice... So instead of mega band limiting through compression and limiting (this is all good for getting the power sound), why not try being musical with it and giving it it's own space in the track... cutting the sound between the other heavy hitting sounds will make it stand out and make your stuff more funky... Not sure if you can actually learn this though :)