well, I just got my map tank and I have had it filled twice. On the second tank I realized that performance was dimished just the slightest bit. So when I finished the 2nd tank, I did the thorough cleaning on it, including the dry burn. Now it is working perfectly again. I have not cut the silicon cap, and I have a hard time believing that you could be chain vaping worse than me. This thing hardly every leaves my hand, so I do tip it quite often so that it is more like dripping than wicking. I also vape 80/20 mix, but right now I have a 50/50 mix in it and it is fine with just the tipping.
I agree with the dont fill it all the way up. I fill mine to below the atty cup, and I dont recommend filling it above the bottom of the atty cup.
Try the deep cleaning and a dry burn. Refill, and drop a couple drops onto the atty, reassemble and vape away
