If you're already checking PZ space that frequently, you *might* want to also check space on other routings or for a day + or - (if you have the freedom to do that). On another thread earlier this year (or maybe end of last year), I saw that Kacee had mentioned that a number of Asia fares have a $120 change fee now. That was the case for a HKG flight for us, and I was able to change to another routing where PZ space popped up and grab those seats. YMMV of course.