There are three ways the landing gear mounts could fail, in shear, in compression, and in both or what you could call torsion. These failures sound like they are mostly torsion. Do you fly on a grass field? I would bring it in as slow as possible, forward speed is probably the major problem. If they are torsion failures, then putting a wire forward of the gear tied into the fire wall would do the trick. Adding additional blocks forward and rearward of the gear would also do the trick. Putting in a lower gear would also help, as long as the prop doesn’t hit the ground, would be a minor improvement. I am just finishing up my u-can-do 60, I fly from a paved runway, and don’t see a problem, but you never know when you may have a dead stick and not make back to the runway. If you don’t want to wrestle placing reinforcement in side the fuselage, adding light ply, say 3/32 under the outside between the gear and fuselage, not sure how wide, but wider it is better, it will distribute the torsions load across the glued area. The area in front of the gear will be in tension, and the area (very little) behind the gear will be in compression.