2002 Continental Brake Problem

Recently brakes began to feel as if they weren't releasing immediately after application. Sometimes they continue to drag for an extended period with a stiffer/higher pedal feel. Replaced pads and rotors, caliper hardware, lubed slides, made sure caliper pistons not seizing, calipers floating normally. Bled all 4 wheels, problem not an internally collapsed brake line. Seems to be all 4 wheels. Any ideas?
 
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