As far as my goblin build goes, I'm using a pair of 28g Kanthal A-1 7 1/2 wrap coils with a ID of 2mm. My first build I used moonrider cotton balls (prob just repackaged organic stuff, I got it for free), stuffed just to the first thread or so of the juice channels with cotton since I was using Thumper from Standard Vape, and it wicked like a champ. Burned my expensive bottle faster than you can say tasty vapes XD
Second build I went for the longer tank section and put a bit more cotton in cuz I was going with Castle Long Reserve, which is 50/50 iirc, and again works great. Flavor is a bit more muted but I think its moreso from the longer chimney, not the wicking.
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If youre getting muted flavor, try closing the air flow down a bit, get a drip tip with a smaller hole, or using a bit less cotton in the coil. Too much cotton in the coil will cause muted and even dry hits. Also too much cotton in the juice channels can cause muted hits too. If youre using a thick juice, try leaving the channels open and build like a kayfun; put the cotton over the channel (but not stuff it in)
But generally I find if I use a wide bore tip or have too much air, the flavor is way too muted.