My arrows don't come off the string with a light tap. More like a medium rap on the string. I want them tight enough to stay put when I nock and arrow and hang my bow up next to me in the tree. I don't want them sliding up and down the string, and because I shoot 3-under, I don't want to dry fire on account of loose nocks.
I bareshaft tune my bows out to 35 yards, and without fletching I don't stray off an NFAA indoor face at that distance. So I suppose that's consistent enough with bare shafts for me.
Something else to ponder. I spent a lot of years shooting NFAA Barebow (string walking). Ever seen anyone string walk with loose nocks? It's not very possible. To be honest, it'd be downright dangerous. Those guys use a snug nock fit and routinely shoot upper 290's indoors and 500+ on field courses. I don't think arrow flight or accuracy is a problem for them, so why should it be for anyone else?