This may be typical of the LT-40s. Mine has about ¼" of down trim cranked into the elevator. I use a black foam "pad" for the wing seat so I'm sure that creates a slight reduction in wing positive incidence. My problem may be power - excess power. Even with the generous amount of built-in downthrust, my TT 46 Pro powered Kadet climbs with authority. I'll have to readjust the servo wheel to ensure I get an equal amount of up and down travel in an elevator that had previously been adjusted at 0º.

I can remember back in the single channel days when we had to test glide our models for proper glide slope then adjust engine thrust to trim for full power flight.

Just thinking on the LT-40 with ailerons and a single servo - would it be beneficial to adjust the aileron horns to have slightly "up" aileron deflection on both sides? It seems if you adjusted them slightly down you'd effectively have permanent down flaps.