I don't play like I used to, but at 52 Y/O, I can still get past 110 SS. I honestly haven't hit a head after 2006 that does anything for me. Yes, there is adjustability, but as far as forgiveness, etc, I just don't see that much difference. I have a 975D Titleist from 1997 that I pull out every now and then and it puts a smile on my face. It is still the most solid feeling metal driver I have ever hit, and I can still squeeze a 300 yard drive out of it. IMHO, the ball is what has changed the game. Any premium ball I can lay 275 all day long with that Titleist, but the newer heads go farther due to the thinner face and CG for higher launch and lower spin than that Titleist. BTW, it is a 6,5* with a DG S300 and original cord grip.
I do want to try a Powerbuilt AF1 from a few years ago.
All I can say to a Club builder would be to make it appealing at address without being a mailbox on a shaft. Have adjustability to 4 loft/lie, 8.5-12.5 and face angle, 3 open to 3 closed. Put 4 adjustable weights that slide front to back, side to side and cannot fall off. Make it solid feeling with some bulge and roll. Come in at 440 CC with an anti glare matte black face, crown, sole. No scoring lines and a small, unobtrusive alignment mark on top.
My $.02