Hi Everybody! Summer time is around the corner, and I'm looking forward to mixing fruit flavored liquid. However, the fruit mixes are all missing something. I have most of TPA's flavors and mix between 20 to 25% - 75pg/25vg. Simply put, they are just boring ... flat and I do add more than one flavor. Nothing on inhale and light flavor on exhale. Could it be I don't add sweetener? What does this actually do to mixes? How much should a person use? Why are my mixes so FLAT? Any assistance with these issues is surely appreciated!