Lol, sounds like me. It's hard to get comfortable on a house shot if it doesn't play to your strengths. I've had one that I've struggled with for a couple years now. The simplest thing I can tell you is to aim primarily to hit the pocket. You may not hit it the way you want to (my biggest problem), but when you really look at the other bowlers, only the best of the scratch bowlers hit high flush for a high percentage of their strikes. It's hard to develop trust in what your reaction is gonna be. It's easier to have more control on tougher shots, because there's not such a pressure to strike on every shot. The scoring pace is going to be lower, so you can just concentrate on hitting the pocket and leaving yourself easy spares.
I've found that sometimes I have to sacrifice this weird pride I have and play the shot that knocks the pins down. If I have to be a fluffer to score, that's what I need to make myself do. I might catch crap like "oh, you really mowed them over that time," but it's ultimately the scores that get people's attention. I can in effect sell out and shoot 750, or stick to an angle that looks more impressive and shoot 650. Besides, that's the name of the game. Knowing how to score is more important than knowing how to bowl on a THS. Sucks, but that's life.
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Hey, I am NOT Michael Jackson. I like little GIRLS, not little boys . .
Rock on kitty.