Unfortunately yeah, I have not found Berlin series to be balanced.
All of their instruments have a dial in the middle that states whatever dynamic level is being played back, which provides a nice placebo effect. However once you try to write with them, you find that the dynamic values are not the same at equivalent modwheel values (this is, bewilderingly,
by deliberate design) and more importantly, the dynamic range is not really commensurate to the dial, it's considerably narrower.
Here is the timestamp in the video where I show a (pretty balanced I think!) mockup of Berlin Brass.
You can see that the modwheel values are all over the place in order to achieve that balance. Particularly the Bass Trombone, that's the instrument with the radical dips. The advantage of Berlin Brass is that you
do get that nice sound of a dozen unique musicians spread across a real stereo field.
With regard to
"mixing as you go" I've had terrible experiences with it. It's just too tempting and easy for me to "force" a new element into a composition with added gain or drastically shaped EQ. Then I come back to the piece a few days later and think "WTF is this layered crap."
Computers can liberate us to be "producers" but only if we have discipline and great ears and are really making creative choices.
I think a
mockup based template (i.e. find a piece you like, mock it up, and there's your template) will free you because you already did the hard work up front. You will find it is
more work than you think, in other words instruments need more drastic EQ, panning, etc. than you would probably think to create during a mixed composing-mixing process.
But in the end this is really good, and in fact liberating. It's liberating because you can give yourself the permission to make these radical EQ and spatialization moves because you already decided you love the mix that you're referencing. Whatever moves get your libraries to sound like that must be the right moves. Then it's liberating again during the composition process because, since you
know the template is balanced to real life, you remove the temptation to make mix moves that "correct" bad composition or bad orchestration.
You should want to get to the point where your "virtual orchestra"
IS a virtual orchestra. You can't turn up the oboes in real life!
The one criticism of the template mockup approach is that it's "inflexible" but it doesn't have to be that way. If you mock up a relatively dry piece you now have an orchestra that can be "re reverbed" into any other space you want. If you are diligent about using sub mix busses for the different orchestral sections, and doing good routing practices for your wet/dry signals, it can be really easy to change your mix without changing the balance within the orchestra.