I think the mind to muscle connection is very important with calves. As well, you just have to try everything. Here are a few suggestions:
Do your calf exercises super slow. Try a 4-2-2 tempo or something of the sort. I have read a few experiences of people shocking their calves into growth this way.
Use a wide variety of rep ranges. Because of their high red fiber content, calves often respond very well to sets as high as 20 repititions. Try from 4-20 reps.
Try circuit training. This is basically a superset, but with even more exercises. For example, start with the leg press calf raise, then seated calf raises, then one leg dumbell calf raises. You could even finish that with standing calf raises unweigthed until you actually hit failure, which is really hard to do with calves because of the extreme burn you will feel.
Try burnouts. Basically, it is dropsetting over and over until you aren't using weights and going to failure. For example, do the leg press calf raise. Have one person standing on each side. Lift until you are a few reps short of failure, have them remove a plate from each side, repeat. Eventually you will get to only the weight of the apparatus or just one plate per side and then go until failure.
Try working out your calves with higher volume and frequency. I just started doing 8 sets per week divided into two session. I used to only do 2 sets for calves, but I have pretty good genetics. I just felt like I was neglecting them despite this fact. Your calves can handle a lot of volume.
Try running up hills with weights in a backpack and ankle weights. It seems crude, but you would be surprised not only at your calf activiation, but the toll it takes on your body as a whole.
Also,
here is a link to a thread with a calf workout that looked pretty good to me.
Hope something works for you. Good luck!