The only downside to lowering tire pressure on a tapered bead tubeless tire is less resistance to breaking the bead seal in an unexpected hard turn or rubbing a curb while parking. There's no safety bead on a taper bead rim to keep the tire from being pushed away from the rim.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!