Honestly the more I vap this juice the more I like it. Its a very complex taste. I really cant put my finger on all the flavors I am tasting here. Its unique to say the least.
It does get better over time. The coumarin flavor is a mimic of what comes from the tonka bean (thanks to wikipedia for that tidbit), and has been used in pipe tobacco for ages.
I asked about the ratio since I originally ordered the coumarin pipe at 80/20 pg/vg and it was harsh when it was young. I now vape it at 50/50, and it has no peppery taste to me at all. Your high VG suggests to me that it will get smoother and sweeter as it ages.
I vape at 18 mg/ml, and like most of my juices at around 6 watts from a T3 or Evod. I just realized that I refill my coumarin pipe clearo more often than any other (I pick from 12 different flavors, ready to go in their own clearos), so it is telling that I refill coumarin pipe the most.
I am also noticing the tobacco note getting stronger just recently (last night), which is really improving this already delicious juice. I just checked the bottle, and it is five weeks old.
Vape on!