Sour, koolada, menthol, sweet tarts, some coffees tobaccos and chocolates. I would honestly just adjust your base % and raise it to 70-80PG range.
I've honestly noticed if I vape zero nic over a period of 4-6 hours the throat hit comes back. Any X-smokers who has jumped from Marlboro reds to lights will be able to relate. It gives the same effect of decreased throat hit. In time the lights become your norm and feels acceptable.
GL and happy vaping