Ok, I'm playing with a band that need to be in Drop C. I've got a Gibson Les Paul with a set of 9-42s on but, in Drop C they're floppy as hell. Is there a way I can tighten the tension without changing gauge or do you think I should just switch to a heavier gauge? If so, which one?

Sinforsale....I guess you were right. I was wrong.
as far as i know, just switch to a heavier gauge, maybe 11s. thats wat i use for drop C
Jackson Dinky DKMGT
PRS SE Paul Allender
Peavey 6505+ 112
I have 9's on my RR3 and i use B Standard and they're fine

If they're that bad change to 10's or 11's