It will take some time for the brakes to seat themselves to the drum. You will probably need to readjust them after a few hundred miles.
The Prodigy controller I had went bad earlier this year. It just wouldn't put out the power to stop the trailer. When it did work it seemed erratic. I went with a Maxbrake controller and it was night and day difference in the stopping power.
Steve, Christy, Anna and Scout (Border Collie)
1994 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley with adjustable stinger
WBCCI # 3072
AIR # 6035