Your coil/wick looks very anemic.
Increase your coil size to a minimum of 2.5mm, 3mm is better, but 2.5 works alright. The larger coil allows for enough wick material, instead of running your tails through the slots fold them in and under so the tails contact the deck, use the shoulders to dam up the wick slots.
Simple, quick, easy wicking, no leaks, keeps up even at higher wattage with full saturation. My current build is Parallel 26g .5 ohms running it @ 30 watts. As an added bonus this wicking method will scavenge off the deck and keep it dry as well. I've never had any leaking using this method.