If someone has repeated trouble with the 10 or any other pin, they're playing the lanes wrong. I can't remember the last time I bowled a set and left the same thing repeatedly. Last night the only leave I repeated was the 7 pin on back to back shots. Tuesday I think I had maybe 3 10s all night, if that. Like Rico said, sometimes all you need to do is believe something is working, and if you throw the ball more confidently, the pins know that. Sometimes that's ALL I've done when I've had a few rough frames, I tell myself to stop worrying about the carry and commit to the shot more, and that fixes it every time. But that's what I said earlier, it's a placebo, and it may work just fine, just not in the way you think it does. Sometimes it's about tricking your brain into being more comfortable, and that translates to the pins.
I was watching Cutthroat Kitchen a couple nights ago. They got down to the dessert round, and this guy got sabotaged and had his sugar replaced with Pop Rocks. He opened a package he thought was blueberry and dumped it into his sauce. Turns out he was looking at the back of the package, and the real flavor of the Pop Rocks was bubble gum. He ended up calling it blueberry anyway, because he explained that if you tell somebody something is a certain flavor and they're expecting that flavor, sometimes you can trick the brain into perceiving it that way. This world famous food expert was doing the judging, and when he was told it was a blueberry sauce, he ate it and never noticed.
So once again, if moving back on the approach works, great! I never said it didn't. I just said it's not working for the reasons you think it is. If you're playing 20-8, and you move back 6 inches, you know what the total launch angle change is in degrees? Rounded up, it's 0.02 degrees, or in other words, 2 hundredths of a degree. That translates to you laying it down 1/3 of a MILLIMETER further right if you back up 6 inches on the approach, meaning if you have laser accuracy, you'll still be overlapping your original track given an average footprint width.
And in doing research about footprint width, I found this: The negatively charged electron clouds on the outside of the bowling ball's molecules are repelled by the negative electron clouds of the floor's molecules - the ball levitates slightly.
I also found this if you want to have some fun:
http://www.real-world-physics-problems.com/physics-of-bowling.html
