well if you go to Poly, ofc it is easier to get in.This is really UNBELIEVABLE and frustrating.
I come from the same school as you do, and I have several friends without too many Math & CS courses or a high tank, who got admitted by Poly with even scholarship.
I think it is worth arguing with adcom, if Poly is really where you wanna go.
However, I do believe a strong applicant as you are, is to receive much better offers. You may just have to wait.
i agree that OP is strong applicant but his low GRE score is gonna kill his chance for any program. verbal does not matter but 145 is way too low. it is so low that admission would doubt whether he really achieves other high grades by himself; if he did, then it shows that he does not take the GRE seriously. then it is a character flaw, worse than academic weakness. it is difficult to defend OP for that low score. i think admission made the right decision but OP can try to argue and say that you will take GRE very soon. i believe the biggest mistake OP made was his ignorance of verbal score. other than that, i think OP is a competitive candidate.