Tip thickness...
I have been retipping my own cues for over twenty five years now. Did it by hand until I got my lathe, almost three years ago. Once the tip gets installed, the first 1/3 gets trimmed off. Seems like a huge waste, but what you get in consistency after it's trimmed is a much bigger benfit than keeping the full original height. Before I put any new tip on, it gets pressed in a vise, solid or layered. This also adds to the tip being more consistent and stable. Once installed, it will get trimmed flush with the ferrule, and have a very slight(2-3 degrees) taper. By doing the new tip this way, I almost never have to get rid of any mushroom after the new tip gets played.