reduce size of purity fields?

I have noticed that a lot of people are struggling to find purity items, and although I dont think purity should be raised, maybe making the fields smaller, so that they would change more often in an area could help this? Just an idea that came to me, as maybe a help towards making people less annoyed with the purity changes? More chance to find matching purity things? Feel free to shoot this down, as I said, I have been seeing a lot of people complain and was trying to think of a way to fix it.