ORIGINAL: SeamusG
My LT-40 (kit build) was powered with an Evolution 52 NX. Straight-n-level at 1/2 throttle. At full throttle, oh maybe a 45 - 60 degree up-line. I replaced the Evo with an OS 46 FX to reduce the power. Not as aggressive but still a "hard" up line. Since this LT-40 now has a bolt on wing (2 1/4x20 nylon bolts at the trailing edge) I added a good old zinc washer (maybe 1/8") under the wing for each bolt to alter the wing incidence. The plane flies straight-n-level at all but wide-open throttle.
I removed the washer shim under the trailing edge of the LT-40 and added two (one each side) #6 washers between the top of the engine mounts and the firewall. This added 2 degrees of addtional down-thrust. The plane flies straight-n-level at 2/3 throttle. At full throttle it now has a solid climb slope (not agressive as before). The glide slope is still pretty good.