I have cousins that have rushed at SEC schools and they have given me the notion that a dress for Prefs should be knee length. Besides that, I do like all the outfits you picked. I would think that bows would be fine as they seem to be very popular / on-trend these days.
It is better that you have the recs you got than no recs at all.
Fake nails are OK as long as they don't look fake. I'm sure there's some nail-biters and weak-nailed sisters in the sororities who'll be sporting them too.
I personally would skip the strapless dresses since your other options for those parties are great and so you have one less thing (is my dress staying up?) to worry about.
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It is all 33girl's fault. ~DrPhil