my theory..... calfs are pure genectics . an as far as i think , calfs are alwys being used (waking)so there pre conditioned to extensive use . so ts hardto work on somthing that never gets rest , maybe try loking at trainin calves a different way . eg curcuit of say 60 .
20 seated straight to 20 standing with load, then 20 each leg ,single standing on a platform.
try that mate. im not saying it will work for every one but it mite work for you.
BTW . is it calfs or calves