Try dropping the pressure a little- - - - -55 or 60 PSI will keep the beads seated, and unless you're hauling max gross weight loads, the tires don't need to be inflated to the top pressure. They're not like tube type tires, which need to have more pressure to keep the rim parts from coming apart and maybe causing a blowout. Letting the sidewalls flex a little is OK unless you' re running close to the maximum weight the tire is designed to handle. Tire shops won't tell you that you can drop the pressure- - - -they're terrified of all the ambulance chasing legal beagles just waiting to haul them into court for giving common sense advice.
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!