OK, here's what I've done, all in an IGO L at 1 ohm on a fully charged mech, organic cotton....
One 5ml 50/50 batch of 9% nic PG base...a little on the harsh side. There was a slight "off" taste to it, but nothing I haven't experienced before.
One 5ml 50/50 batch of 9% nic VG base...definite sweeter taste. "Cleaner."
Added 5 drops of LA strawberry to batch with nic in PG base...tasted "burnt." Maybe due to off taste of the PG nic? Added 5 more drops (10 total)...no flavor, but off taste was there. Added 5 more drops (15 total)...nothing. Added 5 more drops (20 total)...burnt taste with strawberry in the background..
Added 5 drops of LA strawberry to batch with nic in VG base...strawberry was there but weak. Added 5 more drops (10 total)...strawberry there but weak. Added 5 more drops (15 total)...flavor started to "be there." Added 5 more drops (20 total)...tasted "burned."
In general, it appears that the PG based nic gives a harsher taste and the off taste carries into the mix. The VG based nic was better, but I still didn't get that "hmmm...strawberry" that I would expect to be there.
Yes, I agree that I should test the nic, PG, and VG prior to mixing and I will do so in the future. I can see where it might make a difference. I think the VG based nic was cleaner tasting, but I still am wanting more flavor.
One other question...I've been getting VG from WallyWorld. Should I forget that source and buy from Wizard Labs or RTD, or the like?