There's a very narrow spot (on the dark terror at least), where it nicely bright with the tight amount of fizz. Past that it gets weirdly scooped with really piercing highs. I think on the DT it's around right before 3 o'clock.
My bandmate has had problems with the Dark Terror (not the Profiles or anything, he doesn't have a Kemper, not sure if I articulated my ramblings clear enough in that regard haha), but only because (as you said) because of headroom issues. (This is in an hardcore content mind, so pretty hi gainy terr(or)itory *oh how puny*).
It got really middy and untight in a bad way, when the powertubes where giving 99%.
On stages where monitoring or volume wasn't an issue, it was always great sounding, both on and off stage. On loud rehearsal days it was an issue sometimes, especially for me cause his cab hits right in my face (thanks earplugs tho).
But we both were glad that he got a new amp before the tour. We had 2 really old school hardcore clubshows (no mics apart from voices and kick), no chance that the DT would have been powerful enough to be heard. The Jetcity HDM100 didn't have those problems tho. Also a very nice amp!
Gonna take a closer look at that one sometime too
Glad you find the DT pack useful!