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If your batteries are fully charged and the starter is slow then the starter is bad. These are non gear reduction starters so they do pull a lot of power.
I'll suspect a bad starter. Solenoids in the pcb are generally open or closed. Not just allowing some power thru
Battery switch will be bypassed by doing the large pin jump. Install a 10ga wire or bigger and leave it.
Use a smaller jumper and jump from those bigger terminal to pin B. Wire tag 74. This will start the truck by doing this.
Probably a bad starter. Solenoid is drawing yop much power
Remove pcb harness plug. Jump the 2 large pins. This bypasses the solenoids inside
On a battery volts Is one thing. Amps Is another. They can show 12.3 but only have 400 amps rather than 850amps each. Use a load tester.