AZ? So if you put rotors on then you would have had to pull the calipers and the pins. Did you check the pins for wear and grease them with syn brake grease? Also there was a recent warning by I think Bendix on poor rotor quality from some suppliers. New ones for me from NAPA were over $50 each. Did the new rotors match the original ones for thickness of the braking material and possible warping? I guess maybe jack a wheel up and try to determine where the noise is exactly coming from. But yeah gotta go back and check your work.
Scraping sound at 35 when you are braking or foot off the pedal? Really odd it is loudest at that speed. Make sure the dust sheild for the disk didn’t get pushed up against the rotor. The metal is very thin so it is easy to bend.
Generally a very light film of grease can be added to the edge of the brake pad where it slides on the bracket will take care of that squeak.
Did you replace any clips? If so, be sure they are not close to rubbing. I had this happen once, Those anti-rattle clips need to be fully seated so they clear the rotors. Sometimes it is difficult to get them to stay in their pocket in the caliper without some massaging of the bends…