Ok, here are my mains+sub final settings for each seat in the room.
Top to bottom:
Seat 1 (primary seating position i.e. my favourite seat because it reclines

)
Seat 2 (best listening position between both mains)
Seat 3
Seat 4 (wife's favourite seat because she can lay on the couch)
Seat 5
Seat 6
Any more advice for the HT room before I pack it in and call it the best I can do? Should I pump up the sub a bit more? It seems low for Seat 1.