The best solution to all merit problems is by increasing sources number and by decreasing the allocated smerit for each of them.
Some sources have a lot of smerit and they struggle to find the best posts to reward, which may be frustrating, and which could be the case for QA?
For me, this is the main reason that let me prefer to stay away from this hassle.
They can send more merits per post, which is what theymos has been saying all along. Perhaps they can ask to reduce the allocation if that puts too much pressure on them.
There is no hard criteria for a "good" post. Whatever you don't mind seeing on this forum is worth a merit I think.