OK first you cannot prop your way into a hgher performance just by increasing diameter or pitch that will only load the engine where it will barely run. An 11 x 6 on a LA 40 is a terrible idea and bound for certain failure. 10x6 is even more that what I would suggest. Much better with a 10 x 4 or five period. You are likely down several thousand in RPM. With that 11x6 I am surprised it had the power to roll down into that hole much less out of iit.

The Eagle if you built it according to plans and did not start reinforcing where reinforcing is unneeded is a fantastic flyer on the power of an old .35.

Dude order some 10x4's and some 10x5's now then find some help in flying this airplane but just as importantly help in operating and adjusting the engine.

John