Just saw the pictures. I was assuming you had disk brakes. Damn, IMO that is a real problem.
Kool-Stop Salmon pads are supposed to be the best, but a heavy bike going downhill, often - Disc brakes likely necessary.
That bike is not too different from my Crossroads, on flat ground I burn up a lot of rim brake pads. Downhill on the Sanibel bridge I get up over 35mph, that's tapping the brakes a few times and I am 70 lbs lighter, and it is only about 60 feet high, but fairly steep and short.
Makes a Direct-drive hub with regen braking an option worth considering. Or a different bike. Or maybe you like a little hi-speed coasting on the downhills?