Last year, I went through my own nightmare - my controller was applying voltage to my Al-KO (brand) 10x2 4400 lb axles.
Long and short, I ended up doing an axle swap and went from 4400 to 6000lb axles, 12x2 self adjusting.
I've never looked back. I also upgraded my controller to a Prodigy P3.
This afternoon I returned from a ride in the desert - and as usual the LA traffic sucked. A couple of times I had to dig into the brakes and between the controller (being set slightly aggressive), the 5er was stopping the truck more than the trailer when I really had to dig into them.
I would recommend Jason from Best Trailer in Missouri (I can look them up). He's the one who pointed out the backing plates, new drums and bearings were almost the same as new axles.
Oh - don't be discourage because it's an axle swap. That was easier than changing the backing plates on my 10x2 4400's and repacking the bearings and pulling the drums off! I had my 16 year old son out there doing the swap with me.
Total time was less than 2 hours and most of that was getting the wiring set correctly, he shrinked, and in a place where it won't bind.
One last thing. I upgraded all the wiring from the tongue to the brakes to 10 gauge wiring. That way there's little resistance to the magnets because I upgraded the wiring.
Your Mileage may vary..
Josh