RE: Rebuild....but different
Sweep, Taper and aspect ratio all affect aerodynamics. In general, you want a taper of about 0.5 ( tip chord / root chord ). You want as high an aspect ratio as possible, within structural limits and no sweep if possible. Adding thickness to your surfaces might help with stiffness. Hinging your control surfaces at the 1/4 chord will aerodynamically balance them and prevent flutter, as on many full size planes ( and take some load off the servo ). Check out some museums for photo examples...