Trying to understand how much Voltage is coming out of one Conext MPPT 80-600 Charge Controller

The way a MPPT controller works, is watts in = watts out  (minus a couple % consumed as heat and to power the electronics)
at 55V charging the battery - you could expect 116 amps, but the controller has a 80A limiter, so you should do OK on cloudy days since you are somewhat overpaneled.

And be sure you program the controller to match your battery before you do any serious charging

@blacknbart

With 32 × 310 panels the real world output would be 7440 W, that would amount to ~143 A at the typical charging voltage in the constant current or bulk stage where 99% of the charging of LiFePo4 occurs, there is no absorption to speak of.

Then use of two controllers as it will exploit the maximum potential especially on a partly cloudy day when there are only a few hours of clear sky. LiFePo4 batteries  can accept much higher amounts of current compared to lead acid, which makes them suitable for offgrid because the only thing predictable with weather is its unpredictability.

The charging voltage output of the controller will be regulated by the battery, typically the bulk target setting would be ~ 3.45 volts per cell  (VPC ) since the Simpliphi will have 16 cells in series the bulk voltage setting would be 55.2 V, when that is met there will be a short absorption of 6 minutes, this is the constant voltage stage, then it would transition to float at 54 V or 3.375 VPC.

Please note that the values used above were taken from Simpliphi when I used their recommendations as a guide for my DIY LFP bank, their settings are dependent on warranty requirements and are constantly changing, I've attached the file but it may not be the latest revision.

Don't sweat the settings, it's far easier than lead acid, the wiring diagram looks good and appears to be a well thought out ballanced system  in terms of design, loads independent.