sgs aren't trebly
they're very middy and have less high end than les pauls, but also a lot less bass
mid heavy pickups tend to sound quite nasal and dull on SGs, in my opinion, or too "beamy" and saturated in case of brighter higher output ceramics
like a boosted wah pedal or something (like a dimarzio pickup :lol:)
I'm sure I've heard good reviews from forumites using painkillers in SGs, but that would be my last choice for a SG
what you need is a miracle man for the extra punchy low end and cutting top end
pinch harmonics really jump at your face
it's the best for that style and tuning, in my experience
c-bomb as a second option
c-pig for the brutal grind
about the amp, you could try something small, but punchier and more open sounding, like a jet city 20
it's quite cheap and sounds a lot like a big higher gain amp, more natural than the HT5
boosted and using the volume around 4, it sounds a lot like KsE stuff
that setting for band practice volume, of course, but sounds good at lower volumes as well