That sounds like very low pressure for a tire of that volume. I run 60mm Schwalbe Big Ones (64 mm actual) on 45mm rims and they run tubeless at 23 in the front and 26 in the back. I find that any lower than 20 PSI and the tire collapses in corners and handles weird. However, at this pressure (23 PSI happens to be Schwalbe's recc'd minimum pressure) they feel good and supple without any collapsing in corners and generally handling very nicely. I do think the Snakeskin sidewall helps with overall rolling resistance-support-function somehow, too. The key thing is a fatter tire is more supple, so a 60mm tire mounted on a wide rim is going to have more deflection of obstacles anyway.
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