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@CrazyJames
I am around 16 stone 9, I bunnyhop, wallride, and drop stairs/ledges etc on my bike, which also has 700x28 tyres, mine are however rated to 120psi, which I regularly check to ensure they stay at that pressure, i've never had a pinch flat, only punctures from shit you pick up on the road.
Personally I would get some better tyres that can take higher pressures, I doubt you've managed to pinch flat from hopping a tiny bit of hard rubber piping. Problem is with some tyres if you pump them up too far beyond their rated pressures the tyre will unseat from the rim, so if you want higher pressures, get tyres designed rated to higher pressures.