The argyle in the round is killing me!
The video tutorial only shows the increasing diamond, but the decreasing side just doesn't work the same. I've written to Interweave's customer support to see if there are any written instructions to be had. I'm also going to search again for instructions for intarsia in the round (argyle in the round is a subset). If none of that pans out, I'm just going to have to knit the legs of these socks flat and then seam them.