In my opinion the PG is too high. Though the PG is your flavor carrier that juice is super thin. I was thinking you might be vaping on a clearo.
Mix up a few 10ml test samples @ 70VG/30PG and try an 80VG/20PG. Use around 5% flavoring as single flavors and let them steep in a dark cool cabinet for 2-3 weeks and test them then.
Just my 2 pennies.