Running older EMG's at 18V helps, too. Pretty sure you can also do this with the HB-105's, even though I believe they already have more headroom than the EMG's they are modeled after.
Personally, I find the output from regular Blackouts to be a bit hard to tame, but the pickups are quite expressive at just 9V and nicely voiced for rock and metal styles.
I've tried all that. I always kinda found them iffy but when I plugged in with a soloist with EMGs and then my friend plugged in some cheap Amazon guitar with cheap Amazon pickups and at least for metal, it blew the EMGs out of the water even. I'm not hearing what I guess most(not all, as sterile and thin is a comment I hear from others I find accurate) are hearing. Unfortunately it seems like these HB105s are far too close to sterile sounding EMGs than real blackouts which sound full.