If you're constantly adjusting the brakes they could be fitted wrong by the PO. We had an eejit on here a year or two back ranting about how they weren't self adjusting and throwing insults at everyone. When he eventually posted a photo of his wheel hub we saw they were fitted back to front. Or more correctly left to right as someone had mixed up the left and right adjusters.
One of the very first jobs I did was overhaul the rear brakes so can't pin it on PO. I assumed some adjustment would be necessary as the new shoes bedded in. Dismantled and rebuilt one side at a time so unlikely I've mixed anything up. Handbrake works well enough but I've never been able to get the handbrake lever up that far before it locks the drum. Two to three clicks max then it's very tight. It's more likely that this eejit hasn't adjusted them correctly. I won't be insulting anyone over it