Hi Ms Cake . . .
If I understand the thread so far correctly, you still don't know if your Basal dose is too high in general, or if the Lantus is acting incorrectly and delivering its dose in a large peak quite soon after injecting. Is this correct?
If so . . .
there is something you can do to determine this, and it may help in general:
You could switch the timing of your Lantus injection to the morning, rather than before bed.
This would enable you to easily monitor how you feel, and how your levels are, at 2 and 4 and 6 hours after the Lantus injection.
Previous responses have stressed to perform Basal testing, to understand if your Basal dose is right. I don't disagree with this suggestion at all. What I suggest is additional to that.
I had big problems with morning Hypos, over a number of months, a few years ago. Like you, I couldn't remember all my actions. To try to understand the problem better, my girlfriend and I set up a camera, so that if a Hypo occurred we could save the footage and analyse. I was totally shocked at how mean and unpleasant I could be, to the girl that I love. Unless I'd seen it, I wouldn't have believed it possible.
I made a big step forward in understanding the situation, when I moved my Lantus injection timing to the morning. On the first day, I had a significant Hypo in the hours afterwards, and it was very clear that the Lantus was delivering its dose in a spike, rather than evenly over 24 hours. With this knowledge, I then could make specific research and understand this. (I discovered that Lantus Insulin can act like a Rapid Insulin, in certain circumstances).
This may not happen for you. But if not, at least it eliminates 1 possibility which then gets you 1 step closer to the solution.
Regards
Antony