Laura,
You and Pam have the same problem and you both lose a lot of ground when you do it. And that is when you give a reduced shot you roll the dose too far back. If his normal dose is 1.75 then to give a Big Chicken Shot the dose would be 1.5 to 1.25, when you half the dose you are draining most of his shed so he spends 3 days rebuilding that shed and then that is about the same time he gives you a lower than normal preshot, you freak out, drop the dose too much and he goes higher from not enough insulin and you rinse and repeat.
Now there are two ways to handle this situation, either 1) reduce the dose to 1.50 and let him just run slightly higher, or stay at what looks like just about a perfect dose for him and learn to shoot low to stay low.
The thing about a depot insulin unlike the in and out insulins is that the same dose that drops them 100 pts from a number in the 300s may not drop them that much when they start out in the 100s. It is just one of the quirks of working with the L insulins. Once you hit that perfect dose they will remain basically flat with small rises in response to food intake.
Mel and The Fur Gang