Rear Drums Only Free in Reverse Direction?

To me the giveaway was locking up moving forward (self energizing) but not in reverse.somwthkbgvinhave been doing of late is bringing a thermal temp gun with me and measuring the temp of the drum on both sides if the temp is equal they are both braking the same and if they are too tight they will be excessively hot.

I would drive on a road with no stops and then coast to a stop and measure.