No idea what’s TSG, well, I know what it’d be used for, but not what it’s made of, etc.
All my Jetbeams were really nicely lubed, not scratchy or gritty at all. When I do need to lube a light, I got this YEZL stuff from FT that’s nice and waxy in the jar, thins and liquefies on your fingertips, applies nicely.
Lotta people like Nyogel, etc., for their lights, but I don’t have any experience with that.
Just make sure whatever you use is compatible with the O-rings on the beastie.
If it’s too easy to twist, it will have some longitudinal play, resulting is less precise switching, means even more bouncing through the modes. I find twisties very difficult to adjust/operate. Doesn’t matter too much in normal situations when the light jumps a mode too far, but if you rely on your night vision and absolutely want firefly mode (which is nice on this light), a twisty is not a good choice.
Edit: I forgot - when the light was in stock for too long, maybe the o-ring grew a little. That’s another problem. There must be a replacement o-ring in the package you could try.