Yawn. You train them really hard 3 times per week??? Is that working for ya? No? Then guess what? Train them every single day. Actually train them every single day on their own for a full half an hour. Do over 1,000 reps per week. If that doesn't work, do it 1,500 times per week.
Are you getting my point? How badly do you want to change the size of your calves? Because they WILL grow if you force them to grow.
I did this with reckless abandon. Trained them almost every day, negatives, static holds, multiple explosive reps, sit down calve raise, stand up calve raises, donkey calf raises, toes pointed inward, toes pointed outward, stretched the hell out of them, visualized them getting bigger. Again, are you feeling me yet? That's the type of EFFORT it's going to take if you REALLY want to change the size and look of your calves.
My calves are now over 17" after I put over an inch and a half on them in a couple of months. People would never guess I had small calves before. They figure it's just genetics.