408 cooling issues

Magnum based 408
Magnum serpentine belt system
Aluminum heads
Champion aluminum radiator
Full with 50/50 antifreeze mixture
Stainless shroud
Dual SPAL12 fans
185* thermostat with air bleed hole
Fitech go EFI4 fuel injection
Autometer temp guage with matched sending unit
All parts except for the block are new
Factory A/C car, but system is removed

Engine warms up nice, and runs good, but after 5-10 minutes at temp, (190) it starts to overheat, regardless of the fans. I have allowed the controller to work automatically, I have "turned on the A/C" so the second fan will kick on, I have immediately turned on the a/c upon starting it up to try and get ahead of the game, but nothing works. This happens in traffic, going down the road, it doesn't matter.

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