Mix up the rep ranges. I do what I call 'heavy-light" sets on the leg press. Put 400 lbs on and do 8 hard reps. Re-pin the weight immediately for 180 lbs and rep out until your calves are burning and screaming for mercy. Pay attention to how you weight the reps, meaning put the weight on the big toe to hit the inner head, or on your pinky toe to hit the outer head. Do inter set stretching. As mentioned, seated calf raises hit the soleus. Genetics play a huge role in the look of the calves. If you have a high soleus insertion like me, it's tough to make them look like an Asian calf for example. Mine are always a weak point, but I have gotten them to grow. Use them when you walk around. Ever notice a person with a bouncy walk often had good calves?