Front tires cupping on outside edges

[2014SVTblue]

2014 also bad cupping

My 2014 has been really bad on inside edge, with just a little on outside edge. Took back to Ford and they checked alignment, saying everything is OK but did replace the 2 front tires for free. They suggested that I rotate more often, like every oil change... I think there is something else going on here. Does not sound right when some of you are having issue and others are not.. Suggestions??

 

[AZEngineer]

Google causes of cupping.
1) Worn struts on cars or bushings on a truck. Not likely on a new truck
2) Something out of balance. Do you have aftermarket wheels on the truck? If yes are they lug centric or hub centric. If not hub centric you may always have balance issues.

 

[2014SVTblue]

NO, the truck has 8000 miles on it and is completely stock, (Factory).

Nothing has been added of modified.

 

[Red]

What air pressure are you running?

 

[sanddunesaddict]

everyone Ive put on the alignment rack(about 30-40) are toe'd out from the factory.
I lower the air pressure to 30-33 psi and recalibrate the tpms. of course the customer has to agree to this but they are D rated tires they can handle it just fine unless youre going to be at 100mph all day long.
also getting the tires rotated every 3k will help.