Heavier shaft plays stiffer and lowers spin and flight
The fitter explains that moving to a heavier version of the same shaft not only adds weight but makes the whole club play a little stiffer. That added stiffness brings the spin down and the ball flight down a little as well.
Channel: Grant Horvat Golf
Watch official source at 10:43Why this context matters
Comparing a heavier version of the same Ventus driver shaft.