Drop it down onto standard, or at least the road Vibratechnics

They may be too hard.

I run them (on my competition car) and have nightmares sometimes with my B&M shifter in the heat of the moment. When I dont think about it it can be fine, but sometimes it struggles like fuk to find some gears.

I know thats not a box issue tho'

So 5000 miles on the box, and 6000 miles on the hard mounts..... hmmmm about the same time period