Although my wing broke, the most common problem seemed to the horizontal stab coming off. I used tail wires on my first one and have zero issues with the that. Normally I always fibreglass the center section, but my wing failed at the edge of the fuse so I would had to fibreglassed a third of the wing. I would defintely put on some type of tail wires on and fiberglass the center if it makes you feel good, but basically just fly it and enjoy it. Many pilot have installed big engines and flew them hard with no issues. 3D planes are built light for a reason and sometimes we pay the price.