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It's seems like solution looking for a problem. NB. I'm on tubeless, 26mm internal, 26" rims, running 2.35 Exo DHF/DHR and put on 2.5 Super Tackys for special occasions. I'm about 80kg ready to ride, ride briskly but perhaps lighter than others. The shake my head when I see tires and suspension mentioned in the same sentence. You might ride certain places (Alexandra in New Zealand) which is rocky as they come, and you need 30psi at least in your tires, or go to Rotorua and get away with 10 psi less.
I've accidentally ridden at about 15psi a few times, and it's awful, the bike feels terrible. If the difference between running tires at 20 psi and 25psi saves you from rim strikes then so be it. My usual group have a mixture of wheel sizes and widths and I've never once felt like I've run out of grip because my pressure is too high. The tire's job is to grip and and protect the rim.
I'd wager World Cup DH riders are running higher pressures than they let on.
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