Success! I received the Tracer4215BN charge controller where UPS accidentially-on-purpose delivered it to a neighbor, and got it connected up, and the battery bank rewired to 24V in a couple hours.

charge controller
reading 66.1V at 3.4 amps on panels, charging battery at 29.0V at 7.6A

Here it's charging the batteries at 220 watts, and that picture was taken at 5 pm, when the light hits the panels at nearly a 90 degree angle. Compare with the old panels, where the maximum I ever recorded at high noon was 90 watts. I've made more power since 4:30 pm than I used to be able to make in a day! \o/