I think one of the hardest concepts to understand about Lantus is the concept of overlap. Individual cycles aren't that important anymore, each cycle is affected by at least 2-3 cycles before it. You have to look at the big picture and not at the cycle by itself. You might not be seeing much action from THIS dose by +3, but you could be seeing action from the previous dose. You weren't noticing it much before because Blackie wasn't at a dose that did much for her, but now that her numbers are moving you can start to collect some data that can help you learn how overlap affects her. That's why Cheryl and Ronnie suggested a +1 and +2. If you look around at others' spreadsheets, you'll see that some cats have big drops by +2. That is not so much due to the shot they just gave, but to the previous shot lasting longer than 12 hours in that cat. Once the cat is at the right dose, that overlap is what helps Lantus cats surf at around the same number for hours and days on end. The old dose might not be completely gone before the new dose kicks in. Cool!
Incidentally, the overlap and the shed make it sort of pointless to BCS doses due to low preshots. The shed action from the previous dose is still in effect, so this cycle will probably act more or less like a cycle on last night's dose, 4.25. The higher numbers from shooting a reduced dose today are more likely to show up tomorrow. We've all done it, because it makes us feel better, but it really doesn't have much effect on the cycle (maybe it will, because you shot a LOT less than your regular dose).
oooh, just saw Pat's post - is the 3.25 a typo? I hope so!