I don't know a whole lot about the whole sub, re-sub, crack and re-sub, review, crossover, crossing over a cracked resubbed Dick Towle-d reviewed crossover of a re-cracked card game (I have never sent in a card to be graded; I have bought graded cards, though), but if you were so concerned about protecting your investment I don't know why you wouldn't submit them with a minimum grade, or raw (unless you suspected them of being altered in the first place).
I know both companies have their quirks and perhaps you landed on the wrong side of one of them (e.g. SGC is more lenient on centering and PSA more lenient on stains).
I think if Joe P were still around he'd say something like:
Aren't they still the same exact cards???
..... Relax .....
Enjoy them.
