I've replaced 57 Classics with Mules (in a 335).
It seemed to open the guitar up quite a bit. Didn't really seem to make the guitar a lot rockier, maybe a tad more "grit" on tap when I want it. I like the swap a lot. I'm almost certain they'll do what you want...
Like Philly says - Stormy Mondays, on paper, should be a better straight swap. But I've never tried them. I did the swap because I had Mules in another guitar. If I'd been buying from scratch, I probably would have gone for Stormies - I was reaching for the same sort of sounds as you. But I've got a feeling that I'm better off having that sweet grittiness that Mules can add to the top when you want it. I'm actually wondering whether that's the "high tone with the note" that you're talking about?
Incidentally, the 57s are in the other guitar (a Tokai Love Rock). It still sounds nice, but a little more "polite" than it was. I think the 57s are definitely slightly less "air-ey" sounding than BKPs.
Lastly, I suspect you'll like what the 57s do instead of the stock 490R/498T in the SG. Later on, Riff Raffs, do the Duane/Dicky stuff quite nice in an SG :D