Odd Air Conditioning Problem

Can't figure this out for the life of me.
2019 SR5 - 54000 miles

Phoenix Summer so 110+ degrees. Worked perfect(normal) all summer when recent trip up to Flagstaff the cab was not cooling well. Completed trip and now two weeks later symptoms exactly the same. Not better or worse.

Part I can't figure.
Drive in 110+ degrees on freeway at 75mph drivers two vents blow 64 degrees while passenger two vents blow 76 degrees.
As soon as I slow to 55mph drivers side drops to 56 degrees and passenger side to 68 degrees.
Slow down between 20-30mph and drivers side goes to 42 degrees.
Drive early morning with ambient outside at 86 degrees my drivers side blows 35 degrees.
Cabin filter was new and even removed to eliminate that as cause even though it wouldn't create these symptoms. Push recirculation button off to allow outside fresh air and normal slight change but not like the Ford F150 stripped gears issue. Checked all accessible vents under dash and found nothing abnormal. All vents, floor or dash, blow just like new.
I have extended warranty so plan to bring in but just checking if anyone ever hear of a similar issue.

 

Possibly low on refrigerant? Might need a recharge?

 

Isn't Toyota AC known for blowing cooler on one side than the other when low on Freon?