I've had the Verite for a few days now. Can confirm that with the HA300, it is quite bloomey in the mids. Piano notes can sound exaggerated and un-grounded in the piano's 4th and 5th octaves. What I'm doing for this at the moment is EQ-ing in a slight, downward scoop from 500-2000hz.
The up-side is that this bloom effect mitigates the peculiar dip on this headphone which occurs at the border between the upper-mids and lower-treble which many users have opinions about (and which was quite awful for me on my first pair of Verites a couple years ago).
The medium output impedance setting is my favorite, as with the midrange bloom also comes the tube-magical soundstage-expansion and all the rest. This effect is altogether more pronounced compared to the Auteur, which I had until recently. The soundstage of the Verite with the medium impedance setting can sound huge, and that's really cool.
One other caveat, however, is that its bass is a little flaccid on the medium impedance setting to me (even though I like the bass on the HA300 otherwise).
So there're positives and negatives. I don't know however how what I described above compares to what happens with the Verite on other tube amps...
The bloom effect is a little less pronounced on low-impedance, but then you lose out on the tube magic somewhat. High impedance is pretty fun, but probably brings forth too much, IMO.
Edit: Also worth reiterating something that's been mentioned in the past is that, as a 300-ohm headphone, the Verite plays very loud with very little volume input. On medium output impedance, with a 6-volt XLR input and XLR headphone output, and with the volume knob on its very lowest position, the volume of some songs can be way too loud for "casual" listening levels (eg, right now as I'm typing this, I have the digital pre-amp set to -15dB!). As a corollary, switching between something like the Susvara and the Verite therefore requires an extra amount of caution, similar to when you're messing around with headphones and speaker amps. Presumably this behavior gets reworked with the mk2...