Yes, it occurred to me already that I may need to tweak my carb input in order to maintain a balance. I'm also going to start with doses that are deliberately too low. I'd rather undershoot in the beginning and inch my way up to the right level. BTW, your point about waiting four days to see the full effect of a change agrees with just about everything I have ever read.
I'm also doing some experiments -- did one today, in fact -- to determine as exactly as possible (it's never 100% precise, as we know) how much my BG rises in response to a known amount of carb. I will use that metric in figuring dosage. And, as mentioned, I'm going to err on the very conservative side and then adjust gradually as the results indicate.
I feel fortunate in having been able to do a lot of homework heading into this. I have (and am continuing to) read and study everything I can find that has a bearing on this, from books to blogs to discussions like the one we are having now. When I think of all the people who had to negotiate this minefield with insufficient or inadequate guidance (like your early experience), I count myself lucky.
I will keep the blog updated as I go along. It's an ongoing learning experience.