Senga, Really second what DD says above. It's great that this DSN is listening to you and helping you build a plan together, but ask for a hospital team referral as well? As DD says, they can do more, and they are specialists and have more knowledge and experience. You could present it as supporting the guidance you get from this DSN? You could discuss other insulin options with them.
Also, do ask to borrow a CMG, a continuous glucose meter, for a week or two. They do that. That will tell you exactly what's happening at night, and once you know that you'll get the basal issue *really* sussed. And once you get the basal issue sussed, everything will be SOO much easier.
Myself, I low carb, because it means insulin doses can come down. But cutting carbs to 100g/day, which is very mild (I do 30), would be easy and might help. Either way, carb counting is the way to go.
Keep going!!
Lucy