Dude... 18 push-ups is pretty awesome!
Ya, once the bristles are gone on those tees, (or if they are a straight hard tee to begin with) they can really go flyin' if your DD nails them with an upward attack angle of the bat.
Yeah it was the straight hard tee to begin with... and then I cut away the hard part that held the ball and now we are using the even firmer material... this is something I will most certainly look into.