Yep. Vapors tongue.
The only reliable solution I have besides what you have mentioned is to switch out unlike flavors. Change between a fruit and a coffee, for example. You have to bounce around a little.
If you think about it, the same thing is true for just about anything you eat.
And I have found, for me, brushing teeth and mouthwash destroys a vape for some time, so I don't brush my teeth anymore