Increasing on a day cycle is indeed an ECID sort of thing. Cats like to surprise us. Some will give a hint in the first cycle as to what the new might look like, some do nothing first cycle and save the drops for night time. Just keep track of what happens with Panic to learn when is the best time for you to increase. I preferred PM increases.
As for a curve, if you have sufficient spot checks each and every cycle to give you an idea what happened that cycle (like you do!), then a curve is not as important for determining an increase. Basically you want to be able to answer the question "how low is this dose taking my cat?" Curves are good for other data of course, figuring out Panic's onset, nadir and duration for example.