I currently play a 10.5 set on B2 910d2 w/Diamana Kai li 62 gram stiff mid standard length.i carry prov1x on average 230ish with good accuracy. I am 51 and fairly athletic with a Swing speed of low to mid 90's. my question is how big of a difference will I realize if I go to a 9.5 913d2 with a stiff Diamana Kai, l 72 gram shaft? Length/ball flight/feel etc....? I want to ensure improvement and not spend $$ if the improvement is minimal....anyone have some thoughts for me?