& with Top mount Interruptor levers , you may be able to push your center of gravity lower and further back..
Cross Boots had heel spikes to grip sketchy course downhills portaging the bike, until you got back to a ridable section of the course.
But the OP is just negotiating a unimproved dirt road , sorry if you have to slow down or risk crashing.. so it goes ..
walking is still an option ..