I've completed about 10 tracks now and am starting to get it dialed in a little better.
I mix the tracks in biab using the simple mixer.
Stereo, not normalized, volume not too hot
I export single instrument wav files and import to a project in my DAW (logic pro)
With a limiter and a LUFS meter on the stereo out I tweak final volume levels.
sometimes a quick eq if the cymbals are a bit too noisy

With practice I find that my mp3 output (bounce) from Logic needs little or no adjustment in mp3gain.

Good stuff.

Lots left to do

biab2024(Mac) Latest Build
Mac OS Sequoia 15.0.1
Apple M2 pro 32GB Ram
Logic Pro 11