I am changing from Carbon Express 150's to the small diameter shaft (Beman MFX 400). Would I have to change my nocking point?
IMO shoot them first and see,To serve a nock point is very simple,I would shoot the arrows first and then re tune it.
try shooting your origial set up and adjust accordingly
like the above said. i did not have to change mine...but wood to skinny carbons showed nock high/low.
I shoot both and never seen any problem with arrow flight.
There is not that bid a difference with a 5/16 carbon to a 9/32 carbon.I don't see any difference,but I would may change it if I was shooting a 23/64 wood arrow.
Just my opinion, arrow flight can be misleading and hard to distinguish. Point of impact is more important to me.