This is going to sound confusing, but the Blue Angel and Tremoverb cleans are massively different in responsiveness, even though they can be dialed in to sound similar tonally...
The Tremoverb is a Marshall-style amp ('59 Tweed Bassman lineage), including the clean channel - it's all really the same channel, like all the 2-Ch. Rectifiers. This means it's really a bit distorted (harmonically) even when it's clean (not clipping) - important distinction. It has pretty low headroom before it goes into actual clipping, as you've noticed - and the clipping is from the preamp, so it's crisp and crunchy.
The BA is a Fender BF-style clean in that it's truly clean, much less harmonically distorted, and when it does clip it's (by design, this is why it has two separate rectifiers, a tube for the power stage and solid state for the preamp) purely from the power stage. Because it's also cathode-biased it then compresses heavily and you get a very soft, almost flubby (especially on the 6V6 setting) overdrive. Although it remains clean up to the point it clips, it still doesn't have that much headroom and is not *that* loud for a 15/33/38W amp. If you thought the Mark series has too much bass and flub, you may not like this! The BA is also quite dark and midrangy (but not nasally like a Mark), but replacing the tubes with the 12AY7/12AT7 set I mentioned above helps with this, as well as deepening the reverb even further and reducing noise.
The Maverick is somewhere between the two - it reminds me of a Blonde Fender rather than either a Tweed or a BF. By the way, neither the BA or the Mav are "Pure Class A", despite what it says on the front panel, so don't let that confuse you
. They're certainly both cathode-biased (unlike the Tremoverb), but that's not the same thing.