Maybe a little aggressive, but my back of the napkin calculations say that should be about 20fps free speed in high gear (low gear is about 8fps), meaning something else might be a problem as well. It could be that the OP is trying to accelerate from rest in high gear, which would explain the current issue. Be sure you are in low gear when you accelerate (i.e. make sure low gear is the default in code).
I just ran it through the JVN calculator and saw that you would be pulling about 35 amps accelerating from rest in low gear, but almost 80 if doing that from high gear. (150lbs for the robot was my estimate there-battery and bumpers included)
If you are in low gear when this issue occurs, I would look for a mechanical issue perhaps, just like @JacobD suggested.
If none of the above reasons are the cause, see if you have either current limiting or voltage ramping.
One other thing (and the one that my instinct says is probably the culprit) that may be the cause is if your center wheel has become too worn down from practicing and competing in matches. Your center drop (2.5mm) was about 3/32", which is a little low for the larger wheels, but that shouldn’t be a problem. That is, unless the center wheel has worn down some, meaning there is a lot of scrub when turning. Check to see if turning is when you pull the extra high current. I have seen more than one time where teams with vex traction wheels choose to swap them out between comps because of wear.
Good luck in solving this,