Been doing calf raises-pausing at the top for a five-count for the last few weeks and the results have been promising. Using moderate weight on the leg press, ignoring the stretch at the bottom, only focusing on the pause at the top.
Calves are stubborn and I'm not saying this is a magic bullet, but if you rarely feel a burn when working calves, give it a shot. You can test it out in your living room right now. Take off your shoes and try to do 20 (better stretch without shoes. Not as important if you are using weight)