According to the laws of gyroscopic precession, left thrust is a no-no for single engined planes with props that turn clockwise as viewed from the pliots' seat.
Some tiny amount of right thrust will help the vertical line or hover.
Trimming out a climbing tendency isn't brain surgery or require the magical formulae that only the plane manufacturer can provide. If the plane manufacturer was on the ball in the first place, your plane wouldn't be so badly out of trim.
I have designed and built dozens of planes and know that you have to be pretty far off to have a pitch control problem that can't be solved with minor elevator adjustment and shifting the CG.
The only plane I ever owned that was beyond simple adjustments at the field was a Lanier ARF Predator, one of my only ARFs [:'(].