The object of the exercise is to have the stylus perpendicular to the record. It looks like you have achieved this. Small adjustments should be made by ear - but if this is difficult, I wouldn’t bother. You would probably end up worse.
I would not install a compliant pad between the cartridge body and the tonearm or shell. Rigidity is what I seek, not compliance.
As for the Fozgometer, if I remember correctly, it works by equalizing crosstalk. That may work for some cartridges. I tried this with a Koetsu and it ended up at an absurd angle, and sounded terrible. Probably made a mistake of some kind. Anyway, I adjusted by ear, and the stylus ended up perpendicular. With my new tonearm I adjust on the fly to a few minutes of arc and it does make a difference - subtle but it’s there.
I say, enjoy what you’ve accomplished. Well done!