RE: Vertical Spine-Bareshafts
This actually falls right in line with something I've noticed time and time again. That being, stiffer shafts need to be nocked lower than weaker shafts. When you switched to lighter points, the shaft behaved as if it was more stiff and came off the bow nock high. Keeping the same nocking point, if you threw some 145 grn points on there, I'd bet the shaft would be slightly weak (perhaps tail left) and nock low.