With no insulin this morning, he'll probably bounce. I'd let the numbers be my guide. If between PS and your +2/+3 he's flat and high, then I'd probably put the test kit away. If however, the tests are hinting at some "action", I would test more often. Does that make sense?
Here is a more eloquent explanation from the sticky
The Basics: New to the Group? Start here!
Example of an ACTIVE, but NOT necessarily typical Lantus and glargine biosimilars cycle:
NOTE: Until kitty is pretty well regulated, the description below is NOT not what you'd consider a "typical" Lantus/Basaglar/Semglee cycle. It takes time and patience for kitty to achieve a "typical" cycle! The example below is what you're working towards (a nice shallow curve). A relatively flat cycle is the ultimate goal.
+0 - PreShot number.
+1 - Usually higher than PreShot number because of the last shot wearing off. May see a food spike in this number.
+2 - Often similar to the PreShot number. Onset begins around +2 for most cats. You'll probably see an active cycle if the +2 is the same/similar OR lower than the preshot number. Continue testing!
+3 - Often lower than the PreShot number.
+4 - Lower.
+5 - Lower.
+6 - Nadir/Peak (the lowest number of cycle. NOTE: ECID. Not every cat has a mid-cycle nadir. Adjust the hours on this example to fit your cat.)
+7 - Surf (hang around the nadir number).
+8 - Slight rise.
+9 - Slight rise.
+10 - Rising.
+11 - Rising (one of the quirks of Lantus/Levemir/Biosimilars: some cat's blood glucose numbers dip around +10 or +11... not to be confused with nadir).
+12 - PreShot number.