LOL
Fifteen years ago, my daughter used to break wishbones at the same rate as you but she was assaulting the concrete curbs at Southport on a regular basis.
I have looked at a video of a race at your track and the "soft" corner markers look quite wishbone friendly. (Nice track)
On the other hand, it looks like the thin "felt" type of carpet which is probably on top of a hard floor. You get quite a bit of elevation on the cross-over and a bad landing could cause you the problem.
They do not usually break when it's just chucked down the road. Hitting other cars, or being hit, or hitting something solid with one wheel will do it.
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