@dover That is a very valid point. I should have noticed that. A tonearm with vertical bearings that are not perpendicular to the offset angle is a deal killer, the reason being that azimuth now changes with elevation, over warps and with different record thicknesses and as far as I know there is no down side to offsetting the vertical bearing
Your ears are only going to notice a difference in SRA when you are already far off the mark. While it is true that some old records have odd angles, they are also very deficient in sound quality for other reasons and are of historic value only. I would not be concerned with trying to optimize them. If you set your SRA to 92 degrees with the stylus on 150 gram record you will be able to go a degree in either direction without noticing a significant change in sound quality. This is the opinion of many seasoned audiophiles. The problem is setting the contact line to 92 degrees is not so easy. However, fishing around for the right SRA by ear is a PITA and very unlikely to be accurate.