Any heaviness/tightness in your chest, difficulty breathing or history of breathing problems(asthma)?
Are other juices you have 100% vg as well?
Not a doctor but I had all the above symptoms vaping high VG juices. (other than the asthma of course)
After going to around a 80pg/20vg mix it's been much better.
EDIT. Because it is so yummy you may simply be overdoing it a bit.
Maybe try putting the PV down occasionally and breathe some fresh air.lol.
Been there and done that!