New rotors and pads installed but dragging
 

Thanks for coming to help in advance.
I have just replaced my rear rotors and pads and wanna ask before moving on to the front ones. I test drove it, it came with some drag(when jacked up, I can move the wheels in neutral but stilled with dragging) which I do not know it is normal or not for new pads and rotors. I have not do anything else yet, just replaced them and lube caliper pin and pads shims with Permatex 24115 Ultra Disk Brake Caliper Lube Hi-Temp Silicone Formula. When test driving my 8 around apt, I can hear the dragging sound and can smell from the rear brake, the new pads left a track on the new installed rotors so I can eliminate the possibility caused by parking break? Are all new installed pads and rotors dragging before certain miles being putting on or I did anything wrong here?
Thanks a lot. Appreciate any inputs
Should I suspect the product I used to lube the caliper pin? Manual marked lube with rubber grease I used this Silicone based brake lube which I wonder if it is too thick to lube caliper pin?

UPDATE: same method installed front rotor and pads today. Both can be moved freely without dragging. So weird for the rear ones, still looking for help. Thanks in advance

Did you turn the caliper pistons in all the way on the rear when you did them?

Yes, I did. I pressed when I turn the pistons when install the new pads, caliper pistons can easily slide onto the back of pads though. Yesterday, I double checked it and turned it again. Thanks for reply.

You rotated them in like this? (Only the first minute of video, ignore rest)

Yes, I used the same box in this video. Not tools later just the one drove by 3/8 drive wrench.

When is the last time the systems brake fluid was flushed?

OK. I gonna flush it this afternoon and let you guys now. Thanks

anytime i install new brake pads i remove the paint from the "ears" of the pads with a wire wheel or whiz wheel and make sure they move freely in the bracket