Yeah i dont think you really need to compress percusion unless its starting to sit round the midrange, in which case it can give it that really snappy sound. Ive found that you can get a relly clean sound by reverbing the percussion(shock!), then exprting the loop as a wav, and then gatting the loop to all the percusive hits. Then you get rid of that washyness of the reverb while still having that clean effect it gives.