Combine disc and rimbrakes against heat. Disc brake hub and rimbrake rim. On a road frame maybe impossible. Unless you mount a flat bar. Widest possible tyres. 22cm disks: ask if your frame and fork can manage that. 22 bends sooner than 20 and 18. Dual piston diskbrakes have most of the time larger brake pads. And your body can also help breaking.(legs wide, sit upright, open jacket etc.