Guitar is restrung and (almost) set up. It was immediately clear that the new tuners had helped immensely. Moral of the story being: trust your instincts. The tuners are fine; more than anything I'm just grateful they dropped in without any drilling. But they are
super smooth, almost to a fault. You get the impression they'd turn in light breeze. And Grover has somehow managed to design a locking tuner that's harder to string than a non-locking tuner.
On a bench, in direct light, with my old man reading glasses on, I
cannot see the holes for the life of me. If I had to change a string at a gig... F it I think I'd just have to borrow someone else's guitar.
Of course the new string gauges meant starting over on setup: futzing with the truss rod (my least favorite part of any setup), bridge height, intonation, and round and round per the interdependencies there. The nut seems fine in terms of tuning/friction, but I suspect a couple of strings were cut a little too deep - I get a bit of string buzz at the first few frets when the action is anywhere near where I want it, and the whole fretboard is a bit "clangy". Still waiting for the truss rod to settle in before I make any rash decisions about that.
Adding a little truss rod tension (less bow) also seemed to improve tuning stability a bit. I think I'll always have misgivings about this very thin 24-fret neck, and the shape of the SG in general. As I mentioned, the headstock always seems to want to get out in front of me, and if I'm not paying attention, my inclination is to pull it back to where I think it belongs... which of course pulls the guitar sharp. :/ It's ironic that I bought this guitar specifically to smash away on heavy down-tuned music, and it's kind of forcing me to play as gently/ mindfully as I'm able.