I recently tried flattening my tip more after watching some snooker players, who prefer playing with a slightly flatter tip. Personally I've played with a rounder tip than most. The result was that I completely stunk up the joint for 2 days. I got beaten by players that I usually beat easily. It is possible that I went a bit to far with the flattening of the tip, but I was shocked at how much of a difference it actually made. I originally wanted a flatter tip because I sometimes get unwanted trace spin on the cueball on certain shots (which I'm working to fix) and I hoped a flatter tip would help a little bit. Short answer It didn't. It also created other problems.