You would expect this morning's PS to be high b/c the shot was late last night. That tends to give it less oomph. I usually think of it as 0.1 or 0.2 (depending on the cat's overall dose & sensitivity) per hour that it changes. So a 0.3 shot at +13 or +14 is more or less equivalent to what would have been a 0.2 shot at a +12. Conversely if you give a shot like 0.3 at a +10 say, that would be like giving maybe 0.4 at a regular +12. I still thought you should go with the 0.3 though last night b/c things were so uncertain about the dose - so I figured a little on the low side is ok, let the AMPS be a little high (possibly), and regroup in the morning.
You are doing great. The idea is to shoot what makes the most sense to you, gather data and learn from it, and that's how you learn what works and what doesn't, and you start to get the hang of it over time (it took me months). There aren't any magic answers, so don't stress yourself out that you have to figure out the perfect dose with each shot.
