I haven't been able to get my speedtrak to register above 115mph. My fastest flats down the middle never register. I think the angle to the gun is too steep. Maybe a tall tripod behind me might work, but I'm not concerned enough with top speed to try it. I think once you get over 110mph you have more than enough speed to ace anyone assuming you also have reasonable placement.
The trick to speed is rotation from the arm. A lot of people have too much forward arm motion at impact and that actually reduces top speed.