I wring mine out pretty good in aerobatics, however I use good throttle management too. Replace the doublers if that is your choice, won't hurt anything.

You can fold a wing on any airplane due to excessive speed and anything but smooth manuevering while at speed. May have been his flying style. We have guys folding wings occasionally at our field but their transmitters have dents in the stick assemblies from their banging them stop to stop.

I mounted the pants per instructions but traced around them on the wing bottom first, laid a bead of clear silicone. I enlarged the screw holes in the pants so the mounting screw threads were a loose fit. Once the pants were mounted on the silicone bead and allowed to dry, I put a bullet of silicone in the screw holes and drove the screws in but did not allow the screw head to touch the pant. Once all was dry, the pant could flex. I then put a big dollop of silicone between the inside of the pant and the Robart strut (in the narrow area of the pant) so it became attached to the strut. This way the pants couldn't vibrate on their own and moved a little if the strut moved. By the way, the Robarts don't flex much so the whole unit remains fairly stiff yet can flex slightly. No problems with the pants, no cracks, no scuffing.

The stock gear was pretty flexible and probably did more damage to the pants than anything else. Once I added the Robarts and new pants all ground handling issues, including ground loops due to the gear flexing, disappeared. Two seasons on the Robarts and nary a scuff mark on the pants.