I did a bit of checking around today, to see if I could find an answer to the tipping question. The only thing I found was from Callaway. Going through the motions of custom ordering a driver, it asks about length, + or - a certain amount. It then asks about shaft tipping, a certain amount, + or -. I did it with all other OEM drivers and they were the only one that mentioned the tipping.
Must be why all those Project X shafts, their favorite choice the past 32 yrs., play like shit. 😄