Question for the LST Diff Experts...

I recently put LST diffs in my erbe and it fits great. I have one question tho. I am running a Tekin RX-8 and 2250 KV T-8 motor in the system. Well since I put the LST diffs in the machine, when I run half throttle and then squeeze the trigger it kind of "stalls" where it hesatitates to power up. When I hammer the throttle from stop it runs balls out...Could it just be the LST diffs need to be broken in?