I had one set in an RGD2127z tuned to drop Ab and another set in an RGA121 tuned to drop C. Now that I know a lot more about pickup selection than I did then, I would not have chosen those pickups for either guitar. The RGD is an extended scale at 26.5, so playing leads way up on the bridge pickup sounded too sharp / strident even with the Alnico magnet option. The RGA, despite having a mahogany body, had a pretty thick maple cap that really made that an incredibly bright guitar. Really, now that I think about it, Impulses probably would have been much better in both guitars haha.
For your application, since you'd like to stick with Alnico, maybe A-Bomb bridge? From what I understand the SG can have a lot of low-mids going on and the A-Bomb is more upper mid focused. Might also check out the Black Dogs.