When the landing gear block pops out, the piece of ply that has the holes for the two dowels flexes inward, and pops the front of the wing out. I had that happen on mine on a not soo hard landing, with a small four stroke on it (enya 80). When you put the block back in place, add some epoxy, and let it really soak in that area. You dont want to build it tooo strong, so it becomes unrepairable in the event of a nasty hard landing, but it definately could use some reinforcement. I'm now flying mine with a saito 150 on the nose, and it is insane. I braced my tail right from the get go, just because it looked like it needed it. It is fully boxed, and hasn't shown a sign of flex, even on some very high speed blenders and walls.

My only gripe about the plane is that on Saturday, I developed a large crack in the canopy on the right side (repaired with packing tape, because the LHS didnt have one in stock), and then on Sunday, an identical crack on the left side (again, repaired with packing tape now). Other than that, it is a hooooooooot.

Take this chance to double check all your screws, and threadlock all the machine screws. It doesnt take much vibration to begin to work the GP bind nuts loose, especially on the tail.

Steve