I totally agree with your thinking about keeping some distance and trying to wiff her out with bayman. However my biggest problem right now is when she has me pinned with my back against a wall.So, here is what happens: She starts her well-known PPPPP combo, you know, the one that starts with jabs and ends with an elbow. Now, in DOA4 when in the exact same situation, she ended her combo, i could and did cut her with 6P but in DOA5(ps3 version i dont know if it matters) whenever she pins me and ends the combo with me guarding i cant 6P out of it because she can somehow start it again.
The good thing about bayman's 6P in DOA4 was that if you blocked someones combo, afterwards you had sufficient time to hit them with it AND stagger them. So heres what im thinking. Either the speed property of the move changed in DOA5 and i just have to find a quicker punch to seal the deal OR Kasumi is broken in that particular situation and that would really, really suck.
Note that its not a combo like Hitomi's where some of the ending moves break you guard giving you a frame advantage!