Hi Hoyoumac, random one for you. I was recently fitted into a very light Mitsubishi Vanquish PL shaft through a Callaway 30 minute fitting. 4R very light at 44.5 grams . I've had a long wait for the club and getting cold feet about such a light weight shaft. My driver swing speed is 87mph. My ball speed and carry were my best ever but I did not see dispersion we were moving too fast. Felt very smooth. Should I be concerned about this shaft weight with my swing speed?