The other problem will be the leverage against it since the foam offers no structural integrity. You may find it gets bent and tears the turf if you use it for anything other than tying down on the trailer.
I did the same wedge and had the same problem so I ended up just using one of IDOK's towing straps inserted through a slit in the turf.
I made a slit in the turf and shoved the tow strap up from the bottom so the stainless ring is pulled up tight against the hull. All the stress is applied directly to the hull so it doesn't pull on the turf at all.
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