Hi Nancey, nice to see you posting!
Well, after looking at the SS, it's a pretty tough call. It looks like your no-shoot number is 115-120? It looks to me like all of your doses lately are resulting in greens, which is awesome. There are some cycle where you might not catch the green, but I think they are there. The other thing I notice is that between AM and PM preshot numbers, most days, they are within the 20% meter tolerance too, so he's pretty consistent.
Sliding scales work well for some cats. The important thing to think about is that the differences in doses you are shooting are really small. Yes, technically, going up from .3u to .5u is a "40% difference in dose", but we're talking differences that are hard to see with normal eyesight, a few drops really. And if you keep in mind the "20% thing", the numbers you get from a .5 and a .3 are not very different.
I think you could, at this point, pick one dose and stay with it. I don't see where .5 has dropped him too low. You shot that at a 120 yesterday and got 50 points of drop? I think that if you set your "no shoot" number at 120, then you could go with .5 (even if it's a skinny .5?) which again is just a couple drops less than .5, you should be okay. I don't see any numbers that look like bounces, and if you go with .5, and get an number that is in the 40s or 30s, then cut back to .25 and stick with it.
Bob was dosed on a sliding scale, but the ranges were 100 points, and the dose increments were never smaller than .25 units. I couldn't "see" less than that on a syringe (I was using u40's and not U100s with a conversion chart.) My scale was more like "If over 200, 2u, and if between 100 and 200, then 1u." But Bob was less sensitive to insulin than a lot of other cats I've watched here. It only took a couple of weeks for him to go from 1 and 2 unit doses to .25 and .5 doses, so he climbed down the dosing ladder really quickly.
I understand your frustration, because Frodo is "that close" to not needing any insulin. But all that said, his numbers are wonderful. :smile:
Carl