Tabi sock

What little there was of the Tabi sock when this photo was taken earlier today is no more. It’s better I noticed this now, than after knitting a whole sock, but…my cast-on is way too tight on this sock. You can probably even tell in that picture with the way the lace is pulling in at the top. I’m not sure why…I don’t generally have this problem, but then again, I’ve not knit a sock that has a lacy cuff before, either. Any tips? What’s a good, stretchy cast-on? I used the Twisted German Cast-On, which I’ve always felt was pretty darn stretchy, but alas, it’s not cutting it here. Should I just cast on over larger needles, or is there a better cast-on to use? Help!