I have the same brake setup as you and went through a similar problem trying to find more track-suitable pads. As you have with the Ferodo, you will find a tonne of options for the fronts since the 4 pot Brembo calipers/pad shape are shared across basically every form of brake upgrade. The bad news is, almost everyone has made pads for the 2 pot Brembo rears.
The only option I (and my mechanic) was able to find are StopTech Sport pads, so that's what I went with (and some new Zimmerman rotors). While they aren't at the performance level of something like a Ferodo DS or a Pagid RSL, they're definitely a big step up from OE pads. I've since put a couple track days on them and they felt a lot better and I didn't get any fade from them (I did with OE pads).
Part numbers are 309.16090 (fronts) and 309.16100 (rears). I bought from BimmerWorld.
Front:
https://www.bimmerworld.com/Brakes/S...2-F83-F87.html
Rear:
https://www.bimmerworld.com/Brakes/S...3-F34-F36.html