Nice post, good information.
I am not a fan of using VG whatsoever with my products but I really enjoy vaping my concentrates with my portable vaporizers.
I prefer not to have vapor production, this offers more stealth and less waste too. Like you I can take three or more hits and get totally fried.
I have done quite a bit of comparing vaporizing straight oil vs. e-cannabis.
I have only used high quality RSO and high quality QWISO extracts all done with 99% isoporpyl and some winterized with 190 proof grain alcohol.
The device I choose to use the most is the KangerTech AeroTank. I really like how it has air control and draws the air from the outside of the tank, fully adjustable, dual coil, bottom fed. I like it on my SVD, but it is really nice on the Smoktech Magento mechanical vape with a high discharge EH IMR 18650 1600mAh, 30Amp battery.
If you look hard enough the information is all out there in one place like, My Experience with Portable Vaporizers (pen vaporizers) for Concentrated Cannabis Oil and E-Cigarette Oil.
I have been comparing the oils side by side. All around I prefer the e-cannabis oil. I must say that using a small mechanical vape with the KISS cart is very enjoyable.
Some QWISO
KISS cart. Too bad they don't offer replacement heating coils though. Kind of makes it overpriced.
AeroTank on a SVD, variable voltage, variable wattage. E-cannabis (concentrate mixed with PG USP)
AeroTank after a couple of days of testing.