Hopkins Agility electric brake controller problem

You have to set "level" with the white paddle on the side. This turns the inertia pendulum so it reacts to your braking. Nothing wrong with pendulum sensors, just harder to "dial-in". I keep my Tekonsha Voyager as a spare under my seat because it less likely to be damaged by a short in the trailer wiring, compared to the digital inertia-sensor controllers (like the P3, which I normally run).