Curious, how much time was spent running through stabware...? And what are you seeing in the results that you don't like?
I agree, my first two gimbals were great. They were either the pick of the litter, black box versus white box, or they broke-in. I believe the gimbal settles in after so many hours of usage... Others have mentioned the same.
At a minimum, harvest the isolators from the wet gimbal and put them into the new bird...worth a try.