I think I've overloaded the mids. I'm so used to the Herbert's thickness that I kept pushing the mids more & more up. It's either that or you are hearing the isobox, but my Herbert clips are with isobox too; do they sound boxy to you too?
I'll give it another shot sometimes next week, but overall I'm not digging the mesa for recording that much. I might exchange it for an Avenger & see how that one works.
Thanks for pointing out the website problem, I'll fix it when I have time for it.