I would imagine that mahogany + 7-string would sound dark. Maybe try some brighter sounding strings until you can find some brighter pickups. Adjusting your EQ settings might help.
I was gonna try the D'Addario ProSteel series strings, but I don't think the strings would help when the tonality of the guitar itself is this dark. And as for trying to EQ the amp, I've tried EQ'ing everything I possibly could on my Line 6 Vetta head and no matter what I do, it's still dark.
Try the D-activator neck in the bridge. Also look at the Duncan EMTY 7
Or wait until NAMM. I'm hearing word they're finally announcing passive-sized EMGs for 7 and 8 strings.
I was told to try this, putting the DA neck in the bridge. It's supposed to be a lot better. I think I'll try it tomorrow when I get home from work and see.
And I am considering the EMTY Blackouts for it - that is, unless these supposed passive sized EMG's are colser in size to the Phase 1 Blackouts and NOT the size of a metal covered Bareknuckle... I'm trying to not modify the wood or the pickguard if I absolutely don't have to... I sent an email to James @ EMG trying to inquire about these as I'd rather have the EMG's. I may just grab a set of the EMTY Blackouts just because and try them for comparison.
I've heard tone is in the hands and it doesn't matter what kind of amp or effects or pick ups you have. That's what I'm told
Is that really what you believe??? I'm not a believer in that. Granted, the hands do all the work that relate the skill. But it's the guitar, pickups, strings, amp, cabinets and everything else that translates the specifics in tonality.