I apologize for NOT having read all (some but not all) of the posts so if duplicating suggestions - I apologize.

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. With an APC 11x5 prop and shims it will perform nearly all of the basic patterns - yea, full throttle up line is still iffy at best. Remove  the shims and replace the prop with a Zinger 11x6 it behaves like a docile trainer that has plenty of increase in altitude with the throttle for "training night".

Hope this helps ...