In my SG's the bridge PU's usually have UOA5's now (Custom, '59B, 490T, 498T) or a BBQ set (with stock mags). My one remaining C8 is in a Sheraton.
The only UOA5 I've taken out was in a 498T in a LPC (with 250K's) that was too rounded on top, so I put in an A8 for more treble. With a 250K/500K it probably would have been fine.
I've never managed to break a baseplate screw, but you can strip the threads in the plastic coil if you tighten them too hard.