I've only had one shed with Kashmire so far, and he didn't soak either. I also think that yours is soaking because of the mites. Have you taken him to a vet yet to rule out internal parasites? From what Adam told me, the parasites can raise their internal temperature, so he might also be trying to cool off.
It's so worth the peace of mind to get them seen by a vet and rule out any health issues.