I can tell you my 2004 YZ 250 F has 12-15PSi recommendation right on the frame. However these are tubed tires and not tubeless like what is on the Beast.
I think it comes down to where you feel comfortable with the ride for yourself. There has been some issues with the beasts blowing the beads off the tires. Both W&G and my Beast had issues there, and we've since had tubes installed to avoid this.
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