on my kit I found one of the adapter brackets was a little different than the other, just slightly. Must of been the ...offset... when they pressed them. (I'm referring to the bracket you have painted black)

one wheel was a little tighter than the other when I hand spun the wheel.
I didn't think anything of it and just drove.
Maybe I should of been more concerned.

When I let off the brakes the calipers do let off a little. I did not install the residual valves.