Hi team, I'm based in NZ down on Lake Whakatipu. The local golf centre in Queenstown had a fitting day recently and I was fortunate enough to book a slot with a Titleist rep who fitted me for a driver (that's all we had time for). The key takeaway I had was that the shaft on my current clubs was incorrect, and this was responsible for the large majority of my miss hits. Once we figured out the right shaft and played with a few heads, my shots were incredibly consistent, I was blown away. Consistent strike pattern, head speed, ball speed, ball flight etc. I bought the new driver (GT3 10°, on a Tensei 1k blue shaft), but while I wait for it to be made have been experimenting with my current driver (910D2 9.5°) to try for more consistency. Slower down-stroke etc I'm thinking about switching the shaft on my fairway wood (910F 15°) and/or hybrid (913H 19°) to a stiff shaft (I bought them second hand, near new, with regular flex Mitsubishi Diamana shafts like the driver). I'm curious what the opinions are on whether I can just buy a new shaft and this will do the trick or if it does need to be matched to the head exactly (neither are in budget currently but I don't use the wood and hybrid enough to warrant new ones, the existing will last for a good while yet). The owner of the shop was trying to sell me all new clubs and insisted I couldn't just buy a new shaft, and I get that may be the case for 100% accuracy, but surely you can get a 90% better fit by just switching around shafts without paying for a new head etc also?

Pic of the cool freebies from the fitting session and club purchase