If I were willing to re-do the sleeves (which I'm not), I'd pick up a few more stitches under the arms when starting the sleeves. There's a bit of pull across the chest because I picked up so few (9, I think). Live and learn!
I'll tell you what, I didn’t enjoy weaving in the ends on the backside of a p2 x k1tbl ribbed item. I tried to keep the joins in places that wouldn’t be seen much.
KnitPicks seems to have discontinued this yarn (Risata) and I haven't found a good substitute. There are a couple of other stretchy cotton/wool sock yarns (Paton's Stretch Socks and Mary Maxim's Bounce), but neither have a good selection of solid colors. I'd love to know if anyone is aware of any similar yarns. Fixation doesn't work because it's more of a sport-weight.