I have no further advise for keeping the kitty down, I'm sorry, I haven't been very successful in that regard myself. Pinot knows she's not supposed to be there, and the universal (calmly but firmly stated) 'down' will most of the time get her down (unless there is cheese in the vicinity and then it's a lost cause).

You might want to mention to your boyfriend, when he's in a better mood, hysterics have no effect on cats. In my experience, they tend to ignore you even more if you're out of control or loud. They respond to even toned, repeated "commands" (suggestions for their behaviour is a better way to put it) more than shouting.

Good luck! Kisses to Jax!