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My off road riding was when I was small with a vespa 50 special!!!! the a few malaguttis. That were summer entertainment in southern Italy so similar to what you had with added ploughed fields.
Then road bikes and going back to off roading to improve my road riding control. Did off road days at tracks and bought and sold a few bikes. But was never fit enough for a whole days riding. Off road tyres for muddy clagy soil don't last long on the road
Not sure if I got off road riding as i was always trying to be in the right gear at the right speed and rarely going straight.
Yeah dirt bike brakes are definitely marginal with street tyres.
The only surfaces I've ridden on that you have to be a bit cautious with the front are dusty / gravelly hard pack and at the other end of the spectrum, deep sand as you can go over the bars. Not ridden any of the muddy, gloopy stuff that you lot have to deal with....
I'd say I normally brake 70/30 front to rear. You obviously need to be going straight and upright.