4 years ago I tried to see if I can modify my game, be a type of bowler I realize (recently) I am not. I kept thinking so much about "this and that" in my approach and release that it had messed me up mentally and physically. Luckily I didn't drop my average too much along the way, and I still cashed in side action and events.
Even seeing Mike Jasnau and Mark Baker whom both mentioned just two things in my game that needed to work on and that my game isn't far off - not the 1000 things I thought that needed work.
Before the season ended this year, and after shooting <600 (brief slump) for a month, I reviewed the videos with these two coaches mentioned and realized I looked better back then than I do now. So I decided to go back and forget all that brain chaos I created in my head and go bowl my "old way" with the improvements advised by the real coaches, the pros.
The last two weeks of the fall/winter season and thru my summer leagues I haven't shot below 656 (and made $438 along the way too). My spare game has improved as well, only missing 1 single pin since and increasing my multi pin percentage since then. I'm not like others who have tried to change and succeeded. I am not that guy, and the only thing good that came out of this is increased rev rate and realizing I made a mistake trying to change.
On a side note: I'm not sure if practicing on difficult patterns (not THS) have anything to do with my improvements, but I've done well on some few sport patterns and struggled on THS.