2014 Ford Edge rear brakes / parking brake problems

I lifted up the vehicle and loosened the parking brake cables to make it one cm longer than before. Then I tried the parking brake and observed two rear brakes. Here are four images showing the left/right brake when parking brake was engaged/ released. I found that, when parking brake is engaged, on the left rear brake, there is about 2 mm gap between the arm and the baffle (not sure whether arm/baffle are right names...). On the right rear brake, the gap is about 4 mm. When parking brake is released, there is no any gap on the left rear brake, but there is about 2 mm gap on the right rear brake. PS: the parking brake cables had been loosened to one cm longer than before. So, I guess there are two problems on my Edge. 1) Regarding the overheated with rubber burning smell, I thought there is something wrong at the parking brake cable or the signal. When it looks like released, but actually not. This made the caliper engaged with the rotor, to make it overheated. 2) Regarding the rea4 brakes hotter than from brakes, because the left rear brake baffle was not installed on the right position (it should be 2 mm more counterclockwise), the left rear caliper cannot be fully retracted, so the brake pad has drag. Even though there are still 2mm gap on the right rear brake, it was not fully retracted because the right side has the same angle to the left side (for some mechanism I cannot say). Any expert has any comments? Highly appreciated! <<part 2>>