Thanks for the follow-up. I do believe that helps clarify the YPAO.
I've also done some more testing and agree about the "straight" mode. I've tried some more 2ch sources while adjusting the crossover (80) and something like bass heavy music my sub definitively turns on. Not sure why the AVR does not indicate the sub but anyway.
Also watched this one:
not sure if that was spawned from our discussions here (seems rather fitting) but I've now also switched everything back to your recommendations. I guess video format made it more clear.
I still don't notice much difference between small or large speakers but will leave all on small for now to see. Have my cross at 80, and no front for LFE.
If you did see the video. Point #5 mentions limiting the hz. Is this a thing on my AVR? I'm not sure I'm aware of where I would be doing this.
Cheers!