Wow. Tough question to answer without hearing your tracks.
Tough because generally I don't compare the kick and snare levels to each other. I compare the kick to the bass, and the combination of them to the rest of the mix. Thinking about it now, I suppose I compare the snare to other percussive instruments like piano or even rythmn guitar. Overall, I balance tracks against vocals.
Tough questions make vague answers. Sorry.