I'd imagine a large part is just conditioning...I've been riding for 10 years, past 6 years, 1-2 times per week...eventually it gets figured out. If you have big concerns go consult with physical therapist or perhaps a md sports guy.
Il give it a bit, but i really don't know much else to do anymore to. But if this has any reference i have a fucked up left ankle from skating. I just smashed it hard a few times and its never been the same. Also when my calfs go all tight this usually ends up with my ankle going out of wack a tad... yay for fucked up joints.
But i am going to try having my stance a bit smaller to see if its the angle of my calf when i go up a tow rope. It's worth a shot anyways.