After some assurances from other knitters of the Minimalist Cardigan, I decided I was overreacting to the curling of the stockinette. Yesterday, I started listening to T is for Trespass, by Sue Grafton, and before I knew it, I was nearing the end of the two front panels. That's when I realized I had knit the armholes too large on the back. No problem, though; I'll just rip back an inch or so. That I can deal with.