Well, I don't have any specific suggestions, but I can tell you a method.
This is the way I've done all of my KAKs so far. First, you need to set the moves/kombos you want. Then, you take em into practice mode. Now, practice ALL of your moves. Don't like somthing? Go back and change it, then rinse and repeat. It may seem boring and trivial now, but it's the only way to get the character's moves the way you want them.
Oh, one other thing... some moves have different properties when used as a kombo ender, ESPECIALLY with the weapons. Keep a look out for these moves because some of the attacks become pop-ups and such.