S14 rear brakes dragging

[FaLKoN240]

Hey everyone, to start off. I did search.

My rear calipers are dragging after I start to drive the car for more than 10 minutes I'd say. I can smell them when I come to a complete stop and they're hot to the touch, I can spit on the rotor and it evaporates on contact.

1998 S14
Z32 front brakes, stock rears
Stainless steel braided lines all around.
Z32 brake master

PBM frame risers (so the cables are routed funky, but they worked fine before)

My next steps are to inspect the caliper springs for the hand brake for rust.

After that I'm going to replace each rear caliper ($150 I want to avoid this)

Anyone have any suggestions or dealt with this problem recently?

To give you an idea, I already have:

Compressed both rear pistons

Replaced my rear pads with new pads

Checked handbrake cable from the driveshaft back

Upgraded from a stock (non abs) brake master to a z32.

Thanks