Yes it does help, thanks. Yes my reference WAS to an already tuned shaft. Quite an interesting departure from many previous thoughts. I have read (never been there) that many African countries require the ultra heavy shafts for bow hunters, but I wonder what they know, if anything, about the effect of the FOC of that weight?
I might be wrong, but the nock high issue you refer to, will not change with tip weight. That has to do with string nock location. it sounds like yours is a bit high.