That type of stuff used to bother me. Now I don't let it affect my bowling. It really is a mental game and something tough to overcome. Everyone is going to get breaks or have a really good game from time to time. Heck, I even saw a 160 bowler shoot the ugliest 300 game on the planet. All 3 shots in the 10th were nowhere near the same line and he came through the nose tripping pins left and right on every shot. BUT regardless of how ugly it was he still did it and there's nothing anyone can do about it! It's just part of the game.

Maybe try the no-thumb method, sounds like a lot more fun. I am going to switch to 2 handed because I have more fun that way! And that's really what this game should be about! Of course I want to get better and challenge myself but if you are not having fun at the same time, what's the point?