I have 2 of them. I like them. I also have astigmatism. It’s does appear somewhat fuzzy on brighter settings but your lower ones are good. Astigmatism will affect all but prism scopes typically.
Are you sure it’s astigmatism? Red dot was fuzzy to me ,when I went to eye doctor he said it was the start of cataracts and I would just have to live with it for now. 60s and life changes