My first question is why are you compressing the bass? Typically its compressed to control a bass player who lacks decent control of his instrument. (mee too) I never compress more than 3:1 in an extreme case, but typical less than 2:1, try fast attacks and slow releases, 20 to 30 ms, and 50 to 70ms respecfully. Try it, if it doesn't work, try something else and write it some where in case you forget how it sounds..
Peace,
Dennis