Hi, looking to buy a 9.5 degree 913 D3 driver with the Aldila RIP alpha 60 stiff shaft in it. On my irons I have dynamic gold S300 shaft with butt size .600 and Lamkin Crossline full cord .580 core size grips +1 extra layer of tape which equals 1/32" over standard (or .930). Previously I had .600 New Decade Multi compound grips with .600 core size and +3 layers of extra tape to achieve the same size above standard.

My question is which butt size is the RIP alpha driver shaft, I've heard .620 is that correct? I will probably have the white new decade multi compund .600 core grip on it. If I want .930 size or slightly under that, how many wraps of tape (if none)? 

Best regards

Jan