can you try to mix up the spot checks a little bit? I mean get different + hours on different days, rather than just +4 each night. There are indications that Miss Kitty is capable of dropping lower (like the drop from 400 to 107, and maybe lower, on 2/19, and a 62 at +3 on 2/10. It would be good to get an idea of how low she is going on this dose.
Normally with a 163 going up quickly to 351, I would think that it is probably a bounce off of something low.