Mark,
I noted that you said you had been hit by the prop. I have never had that happen to me. Don't know why. Note, the finger hole is about six or eight inches from the nose of the Zagi on the centerline, so it's not that close to the prop. Perhaps your hole is too far back.

I just hold the Zagi at about the height of my shoulders and toss level. Maybe my follow-through gets my hand out of the way. Never played much baseball though.....

Randy