Throwing 3/4 or 7/8 may feel natural, but I believe that's the problem. Mike Marshall's straight overhead mechanics look like they'd make your arm fly out of the socket, but his pitchers are healthy and can throw 95mph too. Cricket bowlers throw the same weighted (5oz) ball straight overhead with a running start, and I don't believe a single bowler has had TJ surgery. They also rarely have serious shoulder injuries aside from tendonitis which in baseball has been pretty much eradicated through band work.