IMO, you have to take a systematic approach to this diagnosis. You have a temp gun, so you are used to this. First thing I would do is switch the drums right to left and adjust. Do nothing else and drive it. If the problem moves with the drum, the drum is the problem. If the problem stays with the right side of the car, it must be the shoes, springs, wheel cylinder or flex hose. Nothing else in there. Most likely is the flex hose as mentioned above, replace it first, then possibly a wheel cylinder piston sticking in it's bore would be second, followed by a shoe/spring problem. Good luck with it and report back.
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