The NICE guidelines report has a couple,of relevant and interesting observations.
1. People tended to need a higher does of Toujeo ( not a lower dose as your nurse seems to think, the insulin is more concentrated, but the amount of liquid per unit is less, if that makes sense)
2. There was no difference in the number of hypoglaegamic episodes people had.
https://www.nice.org.uk/advice/esnm62/chapter/Key-points-from-the-evidence
One thing occurred to me, ( I have trouble with Lantus and overnight hypos) when do you take your Lantus , and how much were you on?
I found when I was taking it at 6pm, I got a surge of insulin around 11pm, just after I'd gone to bed, and my Libre trace looked like a washing line, as it fell towards hypo land at 3am, then rose again towards dawn. Moving it to morning didn't work, because it tended to be running out by the time I woke up, and gave me a huge dawn rise. I now take it at 1pm. The surge happens at 4pm when I'm quite happy to have a biscuit anyway, and if it starts running out, it's late morning when I can keep an eye on my levels. (I'm still tempted to try Levemir, because I'm only on 5 1/2 units of Lantus at the moment, and it has a reputation for being less stable in low doses.)