Good insightful comments by both Freddy and Bob. We look at the P/Hitter matchup and determine likelihood of which side the ball will be hit and have the other MIF cover. Typically, most balls at HS level will be pulled unless a power pitcher or, as Bob says, hitter has inside-out swing, or hitter is otherwise overmatched. Pretty traditional.
I'm somewhat surprised that your 2b is more athletic than your SS. That is not usually the case.