I am in the same boat as Mr Amo here.
I put a bit of duck tape along the back edge of my Firebird XL. This has toughened it up a lot , the prop doesn't do any damage to in now even after filthy landings. I have noticed that the plane is a bit slower and less responsive, but oh well, at least my wing is not getting sliced and diced. What would you have thought that a length of duck tape along the back edge would do?

PS: maybe the weight effect was not so great as the tape covers up some nasty holes where weight has been lost.