santana is 5'10" to 5'11" and throws lights out with a change up. if you can copy his motion and get some results do it, otherwise keep looking. saw the guy cut kc to ribbons one night throwing nothing but 90-92 fastballs, change up at 78 and about 6 breaking pitches for a show pitch. the hardest pitches he threw at 94 were hit off the wall for doubles, then he settled back in and got movement and ground balls, change ups for strike outs. if you can do that you better get after it.
sometimes instead of thinking about mph you might want to consider what you can do to get late movement. if you can't throw high 80's you can still get people out. would you rather throw 86-88 straight and get hit, or 83 to 84 with movement and swing and miss. easy question for me.