Just read this whole thread and I feel your pain (as Bill Clinton would say

)
I have an IBT tank filled with Peachy Criminal and enjoying it just now. Great flavor and good vapor. I used up a couple of cartos at the very first, until I got it right... and "right" for me, was to prime my cartos using the IBT "thingy" (shipping bottle). If you haven't tried doing it that way, you might want to give it a shot.
The method that works for me best is to drop a dozen or so drops of eliquid into the carto (using a toothpick to seal off the center hole), then put the carto into it's tank (in this case an IBT 19mm standard). Then fill the tank about 80% full. At this point I then put the filled tank into the "thingy" it came shipped in and proceed to screw the lid on and off a couple of dozen times. You'll see bubbles as the carto takes on juice and loses air.
Works like a dream, I don't get dry hits and I don't get flooding or leaking onto the battery post of my MVP. This, btw is using either 100%VG juices or 90%VG (which is what my Peachy Criminal is). Full flavor and vapor, when I do it this way. Smok cartos btw, SR, 2-hole punched.
I do, tend to have some difficulty with Ikenvape cartos (punched) when using these thicker, VG juices. YMMV...