The trimetric is either not zeroed properly and your actual state of charge is higher, and/or the PD is faulty as it should seek and hold 14.4v when asked for 'boost' via pendant/wizard.
I'd expect 2 50% depleted group 24's at ~8-AH capacity to be able to suck 25+ amps each initially for at least 20 minutes before battery voltage approached 14.4v and amps begin to taper.
Perhaps PD getting confused by solar voltages above 12.8v, but boost button should seek 14.4v for 4 hours, and if it is not, then It no workkeee as designee
