Check out this site

Brewcrewball.com

They have a portion of their site that is a minor league stat heaven of sorts.
Unless you wanted to go through the game logs of each and every game and seperate the stats yourself, goodluck finding home and away splits for minor league players.....until now. Not only that, but you get even more. They have splits for tons of things past home and road. You get GIDP, BAA, BABIP...tons of things. Seriously check it out, it is very impressive.

Brewcrewball.com