I primarily vape carto tanks, and thought I mostly vape 80/20 pg/vg, I've vaped plenty of >50% VG liquid in carto tanks. For VG, I've found that punching two medium-large holes and two pin-hole sized holes, works like a charm. If it's 75% VG or more, i'll still sometimes have to take a few primer puffs even with the 4 holes, but not to the point of being inconvenient.
Lately I've been doing the 2 tiny and two bigger holes in all my cartos, even for my usual 80PG mix. I don't get any flooding, and I find that the life of my cartos has been extended, compared to when I was only punching two holes.
I should note that I use Boge cartos.
Can you explain how you are punching your holes exactly? Where are the small holes in relation to the big ones etc..... walk me through it if you have time!
