Brake Squeal When Accelerating

Hello, hopefully someone in here can help chime in and point me in the right direction. I have brand new R1 Concepts brakes that squeal when coming from a full stop or slow speed. As soon as I release the brake pedal, it starts squealing. This happens after about 10-15min of driving and the squeal will go away when little brake pressure is applied or gained enough speed and distance. The squeal does get aggressive as brakes and rotors get hotter. It will even get to the point when it gets aggressive enough that it will start making squeals when I apply the brakes and coming to a stop.

Example video: https://www.dropbox.com/scl/fi/fl5j...ey=b1e4v0cio8r493hu5fjyv6k29&st=i41dt7yb&dl=0

Troubleshooting:
These are brand new brakes and rotors on the front. Before I had Stoptech slotted rotors and Toyota pads. They were squealing when I applied the brakes, so I swapped out for R1 Concepts Truck Performance Pads and smooth rotors.

I followed R1 Concepts instructions from the time they were installed: https://www.r1concepts.com/cms/break-in-procedure

-Brake flush
-Regreased slide pins
-Tried brake lubricant on slide pins instead
-checked dust shield for contact

Any help would be greatly appreciated!

 

Wheels turn freely when the truck is in the air? Thats the very first question.

 

Wheels do spin freely when it was jacked up. I was also able to rotate the rotor with the wheel off using the wheels studs but with a little bit of elbow grease