Dear @intactaudio : I think that I did not explain very well on that " bs " about zenith and it's not that be not important the real issue is that no kind of alignment or underhung/overhung tonearm design are the culprit about but the cartridge manufacturer.
We have no single control of what a cartridge manufacturer does and if you buy a cartridge with a way off zenith then return to the manufacturer.
We can't try to " solve " all errors down there, it's if like if you found out a mistake in the LP recording: you can't fix it. The recprding proccess is out of your control same with any audio tem where something is " wrong " and if really is wrong responsability to fix it/support you is the manufacturer.
I can't fix all errors in cartridge/tonearm alignments because even I made time to time " errors/mistakes " about. What I try is to understand what is happening down there at the stylus tip and after that take care for the cartridge/tonearm alignment be as accurated as I can accurated as permit my knowledge levels and alignment tools and that's all.
So, zenith is not my responsability and if I really can't fix why to be anal about:
""" Incorrect Zenith Angle on Cartridges, or incorrect coil angle at the end of the cantilever.
Zenith angle refers to the angle in which the diamond is glued onto the cantilever. Sometimes it is not perfectly straight, it actually happens quite frequently. Or the coil at the end of the cartridge may not be mounted perpendicular to the stylus.
If there is an inherent imbalance with the cartridge or zenith angle errors it is a cartridge problem. ""
Löfgren, Baerwald, Stevenson and the like are away from that issue no matters what.
If you or other gentleman already have an algoritm to fix it then we need all to know it.
Again, yes is important that zenith.
R.