90 mph 7 iron would be stiff flex. Can you maintain those club head speeds for a full 18 holes? Is your swing at that speed producing a semi accurate and semi repeatable outcome? Are you creating that speed with brute strength or through good form and release? So many things that lessons with a pro and a trackman or similar piece of equipment will answer for you. He will show you your swing from the front and the rear, start, stop, slow-mo and walk you through it from address to follow through. He’ll mark up the big screen right in front of you like a Telestrator. Let a PRO tell you you need a fitting or a different shaft not some salesman at Golf Galaxy (AKA Dick’s). A PGA pro wants you to play better golf. A club fitter at Golf Galaxy wants to sell stuff.I'm mostly with you on this statement. I think my address is too upright/open, my grip is too neutral. I also think my take-back is too steep (besides short).
But mostly, I think I need to get some of these kinks out of my game/swing before changing/modifying clubs. The iron fit was probably a little too early. It's only been a few outings since I restarted golfing.
That said, the shaft flex thing is really interesting... I was measured (7 iron) club head speed in upper 80's/lower 90's mph. Every chart I can find says to use a stiff shaft. The fitter wants to put me in a senior shaft (probably mostly based on age.).
I'll work on my technique for now.
You’re correct to improve your technique before spending money on clubs or shafts. Seriously, see a pro for a private lesson. If you love golf and play more than several times a year then lessons are money well spent.
I’m shaking my head….sell a guy with a 90mph 7 iron a set of senior flex clubs!! You’d be all over the damn place. That would be like trying to golf with a fly rod.