I have a few posts in the threads mentioned above. When I first tried vaping (drugstore BLU with menthol flavor), my glucose spiked like crazy too. Was very disappointed and thought I would not be able to vape. A few months later, I tried again with a non-menthol (24 mg/ml nic) and was shocked to see that my glucose readings seemed unaffected. I now vape carmel, coffee flavored juices and don't really like the fruity stuff, so I have very limited experience in the effect of different juices. But, I know that menthol is not possible for me.
Hope you find something that works for you!