RE: Too much engine??
HarpHunt,
Even a prop as large as a 12x6, will not overload a .46 sport engine.
It will keep RPM down a bit, so the plane will be somewhat slower in flight; somewhere around 10,500. But thrust would be pretty high, so it will not slow down much going up-hill.
Overloading only becomes a case, if RPM on the ground is bogged down below peak torque, which for a TT should be around 9K.