should i get some Mycorrhizal Fungi and sprinkle it over my beds?
Well, if you have extra money you don't need, you can do that. But anything that pops up under an oak tree is mycorrhizal. I know you have those in Austin, but with the drought, you may not be seeing many mushrooms. The second best thing in that case is to scrape up some leaf litter/mulch/soil from under an oak tree and use it as inoculate. If there is a mall that overmulches and overwaters their live oaks, that might be your best place to look. The Augusta Mall's hideous landscaping practices keep me well supplied with mycorrhizal fungi.