Hi there, Tracey! (I realize you may not read this for awhile, given the time difference between you and southwest U.S.

)
I'm a longtime AlphaTrak2 user. You did just fine with Mellow, and I totally understand your concern about the hard & fast BG drops that may occur when using Caninsulin. That said, those yellow and two blue BG# you saw in tonight's cycle are actually
very good numbers; not so low as to cause concern about an impending hypogycemic event. But it's great that you're staying on top of the monitoring - good job!
For future reference: On an Alpha Trak2, although the usual "be careful" BG # is anything less than 69 (between less than 3.8-3.9 in U.K. #s) , I'd say that if you see your kitty starts dropping to around a BG of 80 (4.4 in U.K #s) on your AlphaTrak - giving you an added measure of safety here - that's when you'd want to start steering with a some food to bring the BG number up.
You may see a bit higher AMPS in the morning as result of dropping at nadir more than 50% from his PMPS (& the syrup + higher carb food could factor in, as well) - but that's ok. If this were my kitty: I would probably stay the course with that 2.0U again in the morning, just to see where he goes mid-cycle during the day - since Mellow
did experience a nice drop in the p.m. cycle 3/10/15 after you lowered the dose. And in taking a look at his daytime cycle 3/10/15, I have to wonder if the reason Mellow was staying high and flat through his daytime mid cycle could have been that the dose
was a little too high? As sometimes a kitty's #s will stay high and flat when getting a bit too much insulin: This may provoke compensatory hormones to release stored glucose (glycogen), which raises the blood glucose level high - making it
appear like more insulin is needed when it is not.
Just some thoughts here ... hope these may be helpful to you.

- Robin