"do think that being high achieving triplets/quadruplets has made the difference for some - specifically the CC famous yale quads - but I haven’t heard much about twins (granted it isnt as rare as being a quad) "
Exactly, use the four quadruplets as inspiration, I think one of them still posts now and then, to update the cc community. Anyway they got the same, negative advice you’re getting, here’s a sample:
“I don’t think its a benefit to apply to the same top schools”
“Given the disparity in ACT scores, you need to be prepared to get different admission results, especially at the very competitive schools.” (btw their ACT scores were 29, 31, 33, 33)
They got in everywhere (I’m pretty sure) and as you indicated, are attending Yale.
“If we were able to pitch ourselves as two independent individuals with separate passions (demonstrated through my finance ECs and her bio ECs) who are both driven and work hard/well together (demonstrated through shared projects) would that be enough of a hook??”
Hook has certain connotations, I think the poster that mentioned you’d be interesting to adcoms is a better way to look at it. She will also have a second hook as a female applying to a stem major. If you both decide on a first choice, you can apply ED or SCEA to show interest. HYPS are not as concerned with yield protection as schools that use ED. Good luck!