ive stayed working on release mostly. since so many things can be different each shot, odds are against duplication. in fact, duplicating each shot exactly would probably be a disadvantage because lanes change and the ball reaction still would change.
I feel if you get your last step/slide started and know where to start your release, you will have 2 things you can rely on. I find if I dont have a firm arm motion thru the shot, I have inconsistent ball reaction. that's 3 things you can be consistent with. the 4th point of consistency is maintaining hand position.
if you solely "feel" your way to the line and something goes awry, I think it's hard to pinpoint because you aren't paying attention to certain keys each shot.
I think when you bowl well there's always an element of luck involved. like if you miss right (or left) a board, but, your hand position is slightly different and it compensates for the error. strike. you threw it "wrong" but got away with it. same thing if you push through a shot but get more leverage and pull it. strike.
you cant repeat these things. really you don't want them to happen again because it wasn't what you wanted to do Execution
-wise. so, you have to have some keys or "checkpoints" to tell if you executed properly.
Bowling is still a game of area even though you try to repeat. slight errors can be hugely advantageous and keep you in play longer.
I've been through times of throwing a turkey or 4 bagger then cant get past 4. it seems unreal at times where you cant finish a game for 250 and come up with a 4, 10pin or worse a split and lose 20+ pins.
I've had trouble at times working through these "slumps" by practicing. seems like that would be the correct approach to take, but, if nothing else works I take a few days and try not to bowl at all to "forget" something that may be causing the problem.
I do have a video of my 10th frame pf a 300 game (usually don't have video of these right?) that I can watch or I watch pros bowling well to watch their timing and Execution
. this helps me sometimes.
it would be an interesting thread to discuss how bowlers work thru slumps, maybe what caused them, etc...