ORIGINAL: GMMAT
Would your knocking point change if you shot 3 under v. split?
I don't know.
Most likely yes........
3 under applies a much different pressure on the string and arrow. If the bow isn't tillered for 3 under (even tiller) then generally speaking you should expect to have to nock the arrow a little higher than you would with a split grip.
Also don't jam your finger up against the arrow when you draw.....it's hard to duplicate hard pressure and the arrow can come off differently shot to shot.
I like to set my fingers just brushing the bottom of the nock as I draw.