Use the lead acid settings. Not super ideal but the best you can do with what is available.
The panels are mismatched and in no way will produce the 550 watts. The solar controller is a PWM unit, this type will only allow the panel current into the batteries not the panel power. The 3 panels are, 36volts 5.5 amps,18 volts 8 amps, 24 volts 8 amps. Thus the most you can expect is 5.5 + 8 + 8 = 21.5 amps. The controller is rated at 40 amps. PWM40, the 40 is the rated maximum current.
Assuming the battery is charging at 13.5 volts the power into the batteries is 290 watts.
Replacing the controller with a MPPT type and rewiring the panels, the two smaller ones in series and then in parallel with the large panel, would make more efficient use of the panel power. You wont get the full total power of 550 watts due the the panel reduction in power when it gets hot, expect 450 or so watts. The MPPT solar controller would convert this to 33 amps into the battery.
Lead acid battery life , even if correctly charged and maintained, is reduced under high operating temperatures. From a distance its almost impossible to determine if the two batteries have useful life, as I suspect there is limited or non existent test equipment available. Some idea of battery age would be useful.
Reading your other post is seems you plan to ship more equipment including solar panels. The additional panels may influence the choice of controller.
I am a little confused as to the objective. I understand there is a AC fridge to be powered. Is there any low power lighting also powered from the battery.
An outline of the proposed system, existing and additional equipment to be used, funds available, would be helpful in offering advice.
This article may help,
Mixing Solar Panels: Discover Now Dos and Dont's of Mixing the Same Types or Different Types of Solar Panels. Act Now to Save Your Money!
solarpanelsvenue.com
Mike