Based on those graphs alone, I’d prefer with traps closed just for the better results in the kick/bass region.
Waterfall:i have no idea how to get those data :/
Then I'd try out EQing your issues identified with waterfall and check the result.now i disassembled them - and tbh i dont want to assemble them again
Thats what i also think is the way to go. Maybe some more furniture to block the walls, maybe a big book shelf. And some of those absorbers.I'd recommend you to use thinner room treatment and multi-sub solution