Larry gives good advice. If they're too tight in the feet, go with the thinnest socks you can find, and I'd definitely use polypro liners to wick away moisture; tight boots/booties = cold feet. I wear a size 10 shoe but my wading boots are 12.
If Simms could perform a foot transplant (on the waders, not you), as John suggested, that would be the way to go.

Regards,
Scott