Yeah Astrals can be a pain. But just remember right now do only Manual capture. Eventually one day you're astrals will look like this:
Also Red Astrals should be out in Part III. So you could always have a lot better luck with reds then oranges. But just remember only PAtk, MAtk, PDef, MDef, Charm, HP, Block, and Crit are becoming Reds.
I had the same issue at first that Astrals took awhile to get rolling, once you start getting them it seems to make them roll faster.