I think that's good you waited the 15 minutes on the 144. Generally you want to keep the no-shoot at 150. In some cases with tons of data and predictable cats you might lower it, but with her I would keep it at 150. Also you didn't know if that 144 was a rising number - she may get in cases where she does a blue surf, so I think you did the right thing to wait a little and recheck.
Have you thought about going to 0.6? I don't have the SS in front of me, but looking at today's #s that's what comes to mind to me.