Power reserve on mine is very good. It is as advertised. I would buy more without hesitation, but if you’re buying a PO, invest in a LMPO first!
For anyone who comes across this thread, I believe this issue was exacerbated by improper winding of the watch. In other words, I was manually winding this thing every single day to keep it running without wearing it. As I’ve come to understand, that is a big no-no.