I'm actually dripping the Frenilla you sent me now.

I'm enjoying it but the chemical taste is still in the background.
I think the vanilla extract may be what it is. That sucks so bad.
I am going to recommend some steps that has helped me along the way:
Get you a bottle of Biotene, rinse with it twice a day after brushing your teeth
Increase your water intake. Even if you already drink a lot, drink a bit more. Plain water, tea, coffee, and flavored waters don't count.
Leave all juices alone that have vanilla or custard.
Do this for 1 week. You can do it.
Set up a clean build and try just one. After drinking a glass of water. You are trying to cleanse your palette, don't cloud it with flavors until you try your vape.
I had to do this for some flavors that just were not there for me in my first year. Year 2, I would just vape unflavored for a few days. Year 3, I no longer have need to do any of these things. I don't get Vapers Tongue anymore.