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thought the purpose of going tubeless was to run lower pressure.
It's true that tubeless let's you get away with lower pressure than tubes, but only up to a point. You're still relying on tyre pressure to hold the beads on the rim, and unsurprisingly 25psi is not enough on the back at your weight.
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More like you can run low pressures without worrying about pinch flats.
Also is worth considering that some tire/rim combinations are better than others, Black Mamba in my WTB rims never burped, hardly lost any pressure over time and mounted first try with one lap of rim tape, wasn't that lucky with some other brands
thanks for the replys. kinda what i was expecting but thought the purpose of going tubeless was to run lower pressure. (typed half smashed due to 3 from 5 DNFs lol)