well I think the bass would sound alright if you could just sort out the phasing issue.. the different kicks are cancelling each other out. If they are single hits, just get rid of some till it sounds better, if they are loops then just take the bottom end out of some time it sounds better... its like when you mix 2 records together, if you leave the bass EQ in on both records either the bass gets louder (becuase its doubling up the bass frequencies) or it has less power / gets quieter because the kick drums cancell each other out, its all to do wth phase & frequencies...

regarding the white noise thing.. im not exactly sure how its attached to the harpsicord thing, but maybe you could either set a compressor up and have the threshold set (with a high ratio) for just when the white noise thing gets louder.. or maybe you could mix down that part and try and seperate the white noise from the original sound.. so you can proccess it further with effecting the harpsicord sound... im not sure because im unsure how it relates to the harpsicord sound.

Good luck with it.. I think theres only those 2 issues, otherwise it sound ok to me.