I agree with killjoy on that one: definitely need to keep checking the filler that its fully saturated, priming puffs, bigger hole. Boba's bounty and other AVE juices (pretty thick VG liquid) I find are a lot better on single coil carto's (boge 3.0 ohm) but instead of punching a hole I go with two cuts with a cutting wheel on the dremel. One right at the bottom and one towards the top on the opposite side. Then just tilt it a little bit so the lower cut is submerged and the upper cut is where there's air and give it a few good primer puffs so you see bubbles come up from the bottom. The only way to keep a thick liquid like boba's wicking is to, like killjoy said, keep it well-saturated. If its been sitting for a bit and looks dry, I just unscrew the carto and give it a good 3-5 drops into the airhole on the battery connector side. Oh and take nice hard pulls every once in a while to keep it going.