I had two 400a and one I have is close to my Tundra, which is pin up and 4000 abralon by hand on surface of both. To me the 400 is more angular then the Tundra. 400 can get you in trouble because of this and also its hard to see the ball motion for me sometimes with the 400a. Tundra has angularity but not quite as much as the 400a, hope this helps.
My stats-15.5 ball speed back end and 400+ revs. High axis rotation