I once worked at a bowling alley, where Gil Sliker was the manager. He's an ex PBA player, and he gave me the simplest tip I have ever recieved one day while I was practicing. He said "Make sure you walk in a straight line, like you are walking on a board. Put one foot in front of the other." That's all he said, and I just kept saying that to myself on every shot, and trying to do it. Eventually it worked. That might sound too vauge, or simple, but just repeating the words, and trying to perform the action over and over are what worked for me. I didn't even pay attention to where I was lined up. I just kept doing it until I 'felt' like I was going perfectly straight.
Good luck!
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Ben
Quit Crying and Keep Bowling, or Quit Bowling and Keep Crying.
VIVA LA NACION!!!