I've done something similar, so I have 8 bubbles I'm using for room presence but also a huge part of my home/away (I use biasien sensor with a couple other things)
I created a separate sensor that basically says if I'm in any room make that sensor state home. If I'm not in a room it gets marked away. That sensor is what goes for home
/ Away. Works flawless.
If this what your going for let me know I'll share the relevant configs