Left rear brake drum gets hot

So I resurfaced that drum, and it was really warped for only having 600 miles on it. I reinstalled it, and they both got to 150 or so in the rear. I didn’t drive it real far, a few miles or so. The fronts were showing 75 degrees. I adjusted the proportioning valve to were it has less pressure. Today I drove it, and now the left rear drum is getting up to 245 while the right rear reads 80. They’re both adjusted to where they need to be. Both rear brakes engage when you hit the pedal, and release once you let off. I turned the proportioning valve almost all the way in, and am letting the brakes cool down.