Brenda, you really are a font of good info here! Thanks for making yet another excellent point. I will change needle sizes to adjust the ribbing to fit as desired. Sometimes if I go tall enough on the cuff I'll need to go from, say, size 1 to size 2 needles to make it a bit larger. I almost always go down a needle size or 2 when I start the ribbing.
You can't knit the left sock first. Ever.