Best way to taste test is with a dripper. You can make up a 5 or 10 ml batch one flavor at a time, shake and drip between each flavor. You can also add half of each flavor, test, and then the other half if you are unsure of amounts. Or a 100 drop test, each drop 1 percentWell I think I've figured out it has something to do with the flavors and not the PG or VG. I made a small batch of equal amounts of PG and VG and vaping it has no taste, just vapor so it has to be one of the other flavors causing the problem.
Would it make sense for me to load the PG/VG amounts directly into my tank then add each flavor one by one with vaping the contents inbetween to see which causes the bad flavor?