Some Thoughts On Slant Geometry

You say the timing is locked in at 34*? If your thoughts are correct about the leverage on the crank being too small due to the angle at peak combustion pressure being too near TDC at low RPM's, and that it improves with RPM as the pressure peak occurs later when the piston is further past TDC, then isn't the solution to retard timing at lower RPM's to move the pressure peak later in the stroke? Sounds like you would benefit from unlocking the timing and putting in an aggressive mechanical advance set up.....