I take it you're working toe-up? What pattern are you using? If you could link to the pattern it might be helpful. A knit stitch is a knit stitch whether you work Continental or English. I don't understand what you mean by "kfb basically is putting one continental knit and one "picking" knit stitch all in the same stitch". If you are unfamiliar with kfb check this video
. Sock toes can look boxy and that's OK as long as they fit. DPN vs circ needles is a matter of personal preference.