So, here's the latest result.
Our promo pack with a couple of songs in full resolution:
https://samply.app/p/hfjOLxAWVcZNJBPzaPGy
It is still rehearsal recordings in our tiny room of 17m2, with a stereo pair of CM3s on double bass, a pair of Sennheiser MKH40 as overheads on percussion - strategically placed so they pick up silent percussion (udu, frame drums) closer and less cymbal and cajon, additional MD441 in front for flutes (ca.50cm from my nose), which is also used in the mix as a little addition to the overall kit, also close mic for frame drum and steel pans (just a bit, most sound is from the two overheads), T.bone RB500 ribbon in front of the kit, aiming at cajon - like a lower "dick mic" position for some additional close up on cajon and also a bit in the mix for the kit, but very low mostly... even if I mute the dynamic and ribbon mic, the sound is good, but I mix them in a bit to add clarity and texture to some sounds.
The sound of double bass is actually a combination of the spill from MKH40s - there is a lot of nice double bass leak in the percussion mics (I can't state enough how much I like the MKH40s), plus the CM3 stereo in the position we found by experimenting, which seems to be very similar to the double bass spot mic position that is recommended in the DECCA Classical Recording book (Dunkerey, Haigh, Rogers), which I noticed a bit later when we already placed them like that and it was a nice confirmation that the intuition was right.
The spill of percussion in the CM3 pair also adds nicely to the percussion sound. I also can't say how much I like those affordable and truly good sounding mics. I would like to test Neumann KM143 against them one day, though.
The preamps are Neve4081 (all four condensers) and Steinberg AXR4 (DI signals, ribbon and dynamic mic) - conversion is from the latter and I can't hear anything bad about it. Recorded at 32bit/48kHz. (would use 96, but we record all rehearsals and I don't want to waste too much HD space).
Minimal mixing. Very little subtractive EQ (Nuendo channel EQ) on some channels - the double bass is mostly without anything - everything else is tailored to it (but also with minimal touches) and a bit more complex chain on the master buss (because - no mastering planned): UAD Ampex tape (very neutral settings, just a touch), UAD Neve 33609 - just a tiny touch, almost no compression, Gullfoss - just a teeny tiny percentage in mastering mode to tame some resonances a tiny wee bit, Fabfilter Pro L2 - almost no limiting, slow attack, faster release, 32x oversampling, true peak disabled, the reverbs are Relab Quantx and REV6000 in combination and a tiny bit of LX480 on flutes and steel pans.
Kalimba is through a Strymon Nightsky and DI-ed, acoustic sound is also picked by overheads.
A nice coincidence - my friend, the bass player, got a pair of Line Audio CM3s as a gift, during the process of our rehearsals, from another friend (completely unrelated to our project, where we use mine)
Now he uses them also in other bands, mostly jazz and improvised - but usually just one, a bit closer than our position and also the two mics technique - one below and one higher at the neck... and panned mono. The louder bands with drum sets, saxes, horns, etc.
For our project - this is how it will remain, also for the album. I am very pleased with the sound now.
The only thing that intrigues me is - how a Neumann TLM170 would sound in our set-up - a bit closer to double bass and in mono - and the two CM3s in the position we use, but a bit further away (probably not in this room, though). Or a pair of TLM170s (in wide cardioid), instead of CM3s - that would be fun to test one day... But I am happy with how it is now.