rubbing/dragging brakes

[alms24sebring]

I just installed new stock rotors and pads on the rear of my s14. I recently noticed that I tend to smell them when I step out the car sometimes, when I took a look at them, the rotors are turning purple like they're overheating. I remembered when I installes them, that caliper was a b**** and a half to turn, I ended up having to open the bleeder valve to make it turn a little easier, which it did. I dont think the e-brake is holding, there was plenty slack in the cable when I put it all back together. I wanna lift the car tomarow, if they're sticking could it be a bad caliper, dont wanna warp this rotor and have to get another one but pease give any advise.