Ive had similar issues with my right rear. In my case its the adjusters not working correctly and over tightening on that side. Make sure your e brake cables are releasing correctly, there is no axle seal leakage (90wt) or brake fluid contamination on the shoes. If that looks OK make sure the adjusters are not froze up and there are no groves in the backing plates from the shoes wearing into them. If all that checks out Id carefully blow, brush, hose out the brake dust and readjusting them evenly and see how that does. To me best case is these are short wheel based so hitting the brakes hard in a corner or at speed is gonna be tricky at times.