I don't think the quality of the shoes is the issue - I have replaced mine with QH in any case but don't expect them to fare much better in the long run. For me the shoes do not bed in properly because it's not a service brake and owners tend to haul on the handbrake lever to compensate for that slipping feeling which may partly be rollback. Excessive pressure on the shoe bends it across the high point of drum contact and after time the liner starts to let go.
I think inspection is warranted every two years and replacement every four or at pad time and a good regime of bedding in/ cleaning by applying it for a hundred metres or so every so often.
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