I'm still a newbie at trailer towing, but I have an observation or two. I have zero electric brake experience, mine are electric/hydraulic.
My rig is about 9K, tandem axle with hydraulic disc brakes (they are dual piston, possibly quad, I haven't really focused on that) and I just replaced the hydraulic actuator with a Carsilie unit. On my shakedown cruise it took a bit of driving to get the controller tuned and during those early high powered stops, it was pretty amazing how much pull the trailer exerted on the truck, wow. But now it is tuned to a rate that feels like the truck and trailer are working together, I feel the trailer brakes but it feels controlled and comfortable.
My rig is about 9K, tandem axle with hydraulic disc brakes (they are dual piston, possibly quad, I haven't really focused on that) and I just replaced the hydraulic actuator with a Carsilie unit. On my shakedown cruise it took a bit of driving to get the controller tuned and during those early high powered stops, it was pretty amazing how much pull the trailer exerted on the truck, wow. But now it is tuned to a rate that feels like the truck and trailer are working together, I feel the trailer brakes but it feels controlled and comfortable.