As I so often have to remind myself, start with the simple stuff....the basics.
If it is acting poorly on all 3 trailers, it suggests that you have a problem in the truck. And the most common problem around here is corrosion of the terminals or wires entering the backside of the trailer connector. And it is probably the ground connection. Like Dell says, "tight and bright". The plug end of the trailer may have corrosion also, so clean them all up. Usually the truck side is the worst because of likely exposure to road salt.
The age of your controller suggests that it is not the fairly new Prodigy series, nor the P3, but is one of the earlier models. But Tekonsha has been a leader in the controller business for some time, and they make a very reliable product. Most likely the one you have has a deceleration sensor (early ones were pendulums, so had to be mounted quite level), instead of lesser brands having a timing function that slowly ramps up the braking voltage. My 02 F350 came with the DrawTite controller, and after using it for one trip I threw the damm thing as far as I could and got a P3 Tekonsha.
I'd be checking the connectors and the truck grounds to the connector, and then check out the trailer grounds as they rust also.
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