I concur wholeheartedly with the "Flat-Top 127's" Air-Force comment. If you are getting sore, my guess is, as stated, that you are really whackin' the thing. To be honest, I LIKE to do that at times, and I have pleaded with the powers that be to put a Trigger Gain control in the next wave of ZD software, so that the top-out is at a higher range for us crazy Zen-guys.
That being said, Try this: Set your ZD to crossfade mode and practice playing WITHOU triggering the highest level of crossfade! It's harder than it sounds...but I have found that when I get in that "Zone" where I am playing right in the right velocity range, my hands feel like they are ...umm..."Carressing" the instrument (Geo, PLAY NICE on that comment...I mean it!) When I notice myself feeling and playing that way, it's a state of, for lack of a better term, ZEN.