Summer tyres min pressure for washboard roads

[silles]

For a summer tyre, what would be the minimal pressure to drive on gravel/washboard roads?

Car: Suzuki Vitara 2025
Tyre: Continental Eco 6 - 215/55/17 - [ I know it's a cr@p tyre for "soft" roads ]

Suzuki recommends: 33 psi for comfort. But could I go lower, like 25 maybe

this is to improve comfort and not to shake the car into pieces.

[Peanut Gallery]

I know you mentioned softer tyres - but may I check that the dealer did remove any transport pucks from the suspension for transporting the car from the factory?

Yes, I know it might be a long shot, but on a car thats only a year old if that its worth 5 min to climb under the car and double check!