Im not sure you actually need a Mudclaw soled version...try the X-Talon and see how well that performs
Your calves may well be stiff, you need to massage & stretch.
Its worth having a look HERE and talking to THIS man
I've got X-Talon and love them. But in the really muddy downhill hill bits I still prefer the sense of security of the mudclaws. Now an X-talon with a mudclaw sole would be perfect.