A few years ago I was practicing and a friend was watching and giving me some advice. I was having trouble with a shot in particular, and my friend noticed that I was putting a little bit of right english on the cueball. He asked me why I was using right instead of centerball, and I told him that I was using center. He told me that by standing behind me, he could see clear as day that I thought centerball was a little to the right. After he told me this, I actually noticed that my tip was off to the right. I moved it slightly to the left and that immediately felt correct. For some reason my perception of centerball before I made that correction was off. After I made that correction my game improved quite a bit. I play pool right handed and am extremely right eye dominant, but I am ambidextrous. I eat and write left handed, bat left and right handed equally as good, and I cant play a lick of pool left handed (although I'm sure if I practiced playing left handed it would help). Every once in a while my perception of centerball goes slightly to the right and I have to make that same correction again. It's not that far to the right, just slightly enough so that I will add just a hair of right spin when trying to hit centerball. Whenever I make the correction, it feels right, but for some reason my perception changes every so often. Does anyone else have this occurance?