I wrote it in some other thread, if you displace vertical CG it will also not help (so much), because it will be too little overhead (centrifugal force minus gravity) ... if you do it on tip weight, it will work just opposite in reversed flight, the proper solution is flaps warp compensating that difference ... because its effect is "aproximately" constant as we fly "aproximately" constant speed
however there is still some minor difference because of torque and speed change which can be compensated by vertical CG position, but I would say it has to be UNDER the LO in level flight, but all will change over head, so I think it will be better to keep it in line. ... just thoughts, I never tried to balance anything by vertical CG position. My target is to use hig rpm low diameter prop which has smaller torque then large high pitch props giving the same power and that makes it easier to trim. So far works well.