Thank you for your advice. Right now my setup works so I’ll try to not waste my entire weekend playing with technology, but if I need further tweaks in the future I’ll look into ZSWAP.
One question: Do you know why Fedora and PopOS decided for ZRAM and against ZSWAP? As I wrote already somewhere else: I did choose ZRAM for it being default in Fedora, which gave me some trust that people better informed/experienced choose ZRAM over ZSWAP.