Hey man, check out this site
http://home.earthlink.net/~prof.sound/index.html it can help you with just about any problem you could possibly imagine.
I've got a 2x bass drum export too. Once you get them close to eachother, you'll find the small differences actually make your kit sound huge. You may aslo find it's just the toms near your right drum echoing more than the left.
Good luck anyway and keep whining if you don't have any luck.