Yep, having another conversation with myself again:)!
Wanted to share that IRV2 poster 757Driver suggested that as my battery bank aged, it might have been prudent to dial back the Magnum setting for Bank Size from 800AH down lower, to compensate for aging batteries lower capacity. I'd never heard of that, at least that I can recall.
So also checked my Magnum Absorb setting. I'd set it to end at 100% SOC. So if my reported SOC has been off, I could have been 'walking these batteries down'. Just changed it back to Time, and set it to 2 1/2 hours.
Still studying the aging battery lost capacity in relation to Magnum Bank Size settings:)!
Best to all,
Smitty