Hi Teresa,
There's a saying for Lantus: "shoot low to stay low". Strangely enough, when you shoot full doses on low PSs (even dark greens) they don't tend to drop as much. The curve stays flatter. Of course, it's scary the first few times but you'll never find out how Buddy responds to this technique without trying it out on a day when you know you can monitor. It's even more daunting when a cat is at a high dose.
@StephG has experience with this.
I see a bit of dose fluctuation between 10 and 11 u in response to different PSs (and none are lower than blue). When you do this it messes with the Lantus depot and destabilizes it. That can create a bit of BG wonkiness. You've had some cycles (eg. Dec. 08) with lovely runs of dark green and that's your goal. The guidelines for SLGS (and your vet endocrinologist's) say to hold a dose for a week at least. SLGS also says to reduce the dose any time you get a BG under 90. The reduction can be 0.5 u at the dose level you're at but no more than that. For example, on Dec. 03, your AM dose was 11 u, you had a BG of 70 in the afternoon and you knocked the dose down by 1.5 u to 9.5 u in the evening. SLGS says a dose reduction of 0.5 u was the way to go, so down to 10.5 u.
You can also give a full dose on lower PSs as I said above. For example, on Dec. 05 PM the PS was 108 and you decided on a no shot. You have lots of data on Buddy so you could have shot the same 10.5 u dose as the AM and he might have continued on in nice numbers overnight and into the next morning.
These are just a few examples of things to try. Feel free to ask here - it's extremely busy on the L&L forum. Does this help a bit?
@Yong
@Djamila