The Sidi factory insoles are crap. Try something else. Anything else. Even the worn insoles from your other cycling shoes. I like the Specialized insoles, because my orthotics or running insoles are too thick (gives me heel lift). I use the high arch support one, but there are 3 support levels to choose from.

BTW, the pain seems to go right down your peroneal longus tendon. If you don't have the pedals set to a pretty wide range of float (the zeros are adjustable, right?), then you might try that to see if maybe cleat angle (toe in or toe out) is the problem. Another thing to try is moving the cleat farther back towards your heel. I got bad peroneal tendinitis for a while and moving the cleat back a bit helped me a lot, more than the angle, though the angle can make a difference (overuse with the toe too far out, or strain with the toe too far in).