I've had the same problem with overheating brakes, see this thread:

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2138777/2.html

Finally, after a long time of adjusting and trying this was the answer:

Finally solved the problem....
Being só sick of all this at trying to adjust the shoes with no result I ordered a new pair of shoes. This time I ordered Wagner brakeshoes. The first ones were from Raybestos.
When they came in, I compared them with the Raybestos shoes. At first sight the were exactly the same but.....when I measured them it seems that the Raybestos were 0.5 MM !! wider than the Wagner.
Anyway, put the shoes on, adjusted them, took a test drive and...No heating up at al. Brakes work perfect now.

Maybe it's worth to look at ?