OK. So I tried the Starbucks Via in 25 ml of 50/50. It was way thick and still not completely dissolved. I dripped some of it just to see and it did not vape very well. Didn't really taste like coffee either. I will try it again with all PG and see what happens.
While conducting that little experiment, I got thinking.....Via is made from microground coffee and may not be as soluble as regular instant coffee since traditional instant coffee is actual brewed coffee that has been dehydrated.
Experiment #2 consisted of 1/2 pack of Taster's Choice Columbian Gourmet instant coffee, 10 ml PG and 5 ml VG in a glass bottle. I added the PG 2 ml at a time and set the concoction in a warm bath, shaking it up occasionally. At 10 ml everything seemed to be dissolved. Dripped a little to see what it tasted like, and decided it was too acidic so I added a squirt of TV sweetener. Seems to be OK now, but it does not taste like a cup of coffee. Still, it's better than the TPA Coffee Clear I bought. So, I'm going to let this sit until this weekend sometime and see what happens. I'll post again with the results.