It sounds to me like you didn’t give them a fair shake because you think you know more than they do.
As a 24 handicap player, I doubt putting is your biggest issue.
If you want to beat your golf buddies consistently, you need to be a better ballstriker than they are. Age is not a limiting factor. I know guys in their 60s who are single digit players. Hell, I know a guy who missed shooting his age at 76 by two strokes.
I personally don’t think it matters much between most balls, except the really cheap ones from Walmart (I forgot the brand).
I have a decent handicap and have been playing used balls I got from my instructor a few years ago. I played a few rounds with new ProV1 and my distances/scores remained the same.
I doubt that’s why you hit the ball fat with this method. It’s more likely that you’re doing something else to compensate for the setup. Jim himself rotates when demonstrating his swing and rotation alone will not drop the club head.