re: Anyone here use the 10-finger "baseball" grip when gripping the club?

I think the only pro I know of that ever used a baseball grip was Tommy "Two Gloves" Gainey. If not a single player on tour uses a baseball grip and the only one that did wore two gloves at all time, that should tell you not to do it.

Interlocking or overlapping will benefit you in the long run. If you're just going to play two or three times a year, then there's no harm in using a baseball grip. But if you play fairly often, you need to force yourself to switch, even if it hurts your game for a little while.