I see. Be careful with the placement and size of your gas giants since a single large one is enough to wreck the whole thing. I forget the point where the outer ones turned into wrecking balls, somewhere between a large neptune and a small Saturn I think. Massive ones close in are safe though as they'll hold their own. Also, if you have the two stars in an inclined orbit, your planes will eventually shift their inclination to roughly that of the binary orbital plane.