Hi all, I was given a 915F 3 wood with the stock Diamana M+ 60g shaft from family they switched to 915Fd. I plan to install shaft of my choice 83g shaft much heavier than 60g. My question is if Titleist use lighter head for lighter shaft options to achieve "standard" swingweight for all head-shaft setups or do they use same head and swingweight is different for each combo?