Yeahhhhh so this is a bit irritating. Luckily, I'm not performing for awhile (especially with all of this craziness)...but I'm running in to the same thing.
All the slots in a performance, have the same GAIN, but the volumes are different for sure.
I'm not exactly sure how to to overcome this GAIN issue. If Kemper has any ideas, let's hear 'em!