Brake Issue

I had some brake problems. LR and LF pads wore all the way down while the Right side was fine. I ordered new ceramic pads and rotors all the way around and figured I would paint the calipers while I had it apart. The LR caliper was seized. I couldnt get it to twist back in. Even rented the tool from advanced auto parts to try to get the piston back in but the tool wouldnt work. I replaced the caliper and bled it with no issues. Didnt have any problems with any other caliper. I replaced all the hardware on the rest of the calipers for good measure. Put it all back together drove it around and smelled somethin funny. Figured it was just the coating on the rotors wearing off. I started to see a bunch of brake dust on the wheels, the LF had a lot more than the rest and I noticed it was VERY hot after driving. I wanted to test it so I drove around town a little and down shifted instead of braking as much as possible. After I got home the the LF rotor was too hot to touch. The RF rotor was warm but I could touch it. I figured that was proof that the pads were sticking. I replaced the LF caliper and the rubber brake line. Bled the caliper and its all back together. After I bled the caliper I was not able to turn the rotor by hand after the brake pedal was released. I had to work the caliper right to left and do the same with the rotor before I was able to turn the rotor. Is this normal? Im getting a little frustrated with this brake job.
I did have a slight issue when replacing the brake line. The brake line came with 2 copper washers. I only seen noticed one while attaching the brake line to the caliper. Tightened it all down and it leaked while bleeding. I couldnt figure out the issue... then I saw the other washer. So I put that on also. Now the brake hose bolt went through 2 washers then the block on the brake line then into the caliper. Still leaked when I tried to bleed the caliper. It leaked right from the block at the caliper.. Then I took one washer off, put it between the block and the caliper and then it stopped leaking and I was able to bleed the caliper. I dont think this is how it should be...but its working. Could the washer setup be the reason why I cant turn the rotor by hand? Could it be something else? or is it normal?
Thanks in advance for any input.

I replaced all the hardware on each caliper when I replaced the calipers. New pins, bolts, seals and anti rattle clips. I greased all the pins before I put them in. It was easy to push the piston back in on all of them except the rear one I replaced. But I replace the LF caliper anyway.

could it be the master cylinder?

Sorry. Its a 99 GT Vert.

I did crack open the bleeder to try to release some pressure thinking that might help. some fluid came out but the rotor still wouldnt turn. I took the caliper off and the rotor turns no problem.

I have the car on jack stands all the way around now. The RF wheel is very hard to spin. The 2 back wheels have some drag but I can turn them with one hand. If I give it the old wheel of fortune spin it wont go around 1 time. Is that too much drag for the rear?

yeah the fronts are dragging. I have replaced one caliper hoping that would fix the issue. Using a C clamp I pushed the pistons back in and then hit the brakes, it was still doing it. Its like the pistons are not retracting after the brakes are released.

Thanks for the idea. One of the calipers is new tho..