As was said before, your wick looks saturated. If you are starting out good and then developing dry burnt hits, then wicking is probably too slow for the voltage. I vape 80pg/20vg with no issues on a Vision Vivi Nova 2.8 ohm coil at 3.7v on a Provari. I use 3 ohm Boge cartos sometimes and vape them at about the same voltage.
My favorite method for saturating a carto is this one. You can use this method for a punched carto since the holes are covered by the condom sleeve.
+1 for the Dr.'s method for pre-priming the carto before inserting into the tank.....Also, you will ruin your carto if you put too many holes in it because it will consistently flood as mentioned earlier in the thread. I personally wouldn't put more than 2 or 3 holes in a carto. If you have a carto with pre-drilled holes your could try expanding one or both of them with a punch or saddle valve tap (you can purchase one at Home Depot for a few bucks)
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