But what if we were to say we excel when we are together, as our board scores could show? I actually honestly believe we actually bring each others performance up.
Your board scores show nothing of the sort. If anything, they show that you bring your brother's "clinical" performance down.
And to add I don't think its weird for twins who went to college and medical school together, to want to match in the same residency. It seems like a fairly legitimate thing to do, but if you guys honestly think its a bad idea and will decrease our shot at matching, then I'll steer clear of it.
It's weird as hell, and you'll be hard pressed to find people on the interview trail (PDs, residents, applicants, janitors) who don't think that way. But whatever, it's your life. Also, it's not like you're going to fly under the radar with PDs on this either, assuming you both wind up applying to the same specialty (which is not in any way clear from your OP).
Here's the thing about couple's matching that you probably don't know though...nobody but you has to know that you're doing it. Recognize that telling programs that you're doing this is likely not going to score either of you any interviews that you wouldn't otherwise get (and bringing it up is going to put you back in the "weird as hell" loop). Leave that part out of it. But when it comes time to make your rank lists, go ahead and couples match if you're so inclined. Just be sure that you rank every possible combination of programs so that you both match, no matter what. To do this, once you get done with all the program/city matches you have, you will continue the list as such:
My program 1:Brother's program A
My program 1:Brother's program B
My program 1:Brother's program ....
My program 2:Brother's program A
My program 2:Brother's program B
My program 2:Brother's program ....
My program X:Brother's program A....
He will do the converse. Your rank list will be a total clusterf*** and you'll probably mess it up quite honestly. But if you don't, you should be fine.
There's still a non-zero chance of not matching in this scenario, but it's pretty low unless one of you is a total sociopath.