I have Kammerstein quad rails in a Zerberus. They're hot & thick but also fairly focused & tight for their power.
Actually they're quite fat even when split, not clean & clear and definitely not bright.
Haven't tried them in parallel; that sounds pretty inviting.
I intend to pull them one of these days and install my last Breed set.
Might explore parallel wiring with the quads in their next home. Not sure where that will be, though.
High output hums aren't really my thing - I stick to vintage, vintage-hot, or medium output.
The JB is at the upper limit of my comfort range. I don't like needing to redial things when I switch guitars.
.