Well for now I'll Use up the 31 and see how that goes. I cannot fit T 105s or any GC-2 due to height, and I think the T- 1275 is also a bit tall for either location I have available.
I'm also trying to meet minimum bulk current recommendations via solar only, so I am not looking to increase capacity, and I can't realistically put any more solar on my roof.
Right now the 31 just barely allows the hood to close, and the AGM 27 looks lonely in the battery box that 2- 27s can fit within.
Last night I only took 26 amp hours from the 31 and at some point it dropped in the 12.1v range Likely when I plugged in the depleted laptop while the fridge condenser was running.
Right now 6.6 solar amps are holding it at 14.4v, and once this tapers to ~0.8 amps I have a 15.3 volt float/ finish programmed.