Of course test first, but with the numbers you have seen this cycle, shooting an hour early should not be a problem. If you get a much lower number at shot time, we might have to rethink that. And you could get right back on schedule tomorrow morning and shoot at the normal time, numbers being good for shooting of course. The only times you really need to be concerned is if you see a lower than normal PS reading, or a late nadir, when considering an early shot with Prozinc. It looks like today, Lucy nadired a little bit early (I'm thinking it happened in between those two blue numbers you got), so I would expect a pink PMPS number even an hour early.
Carl