Run YPAO until the 773 sets the sub volume to 0.
Set all speakers to small. Crossover to 80.
If you want to increase the sub volume tweak it at the sub.
I use the "Standard" DSP for most 5.1 material.
I dont own a PS4. You might want to ask about that in the PS4 thread.
So just wondering - why would you want to tweak the volume at the sub? Does it mess with YPAO if you set the sub volume in the reciever?