if the pH / KH continue to fall and/or stabilize lower than you'd like, you can always throw a little bit of crushed coral in the filter (don't put it in the substrate in case you need to remove it). I have really soft water and my pH kept dropping really low, I threw a little but of crushed coral in the filter and my pH and KH have stabilized very nicely.
I've never used AS so I don't know where the levels stabilize at though.
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