I'm using the same drivers, crossed over at about 200hz. With the minidsp it's easy to play with the XO.
They all need to break in real good, I bought the a12p when it first came out, in constant use for a year, and I'm only starting to feel that they're coming into their own.
Same with the alpha's, break them (test tones... 40 hz) in and brace them, sounds good.
Good luck with it.