I have made single coil builds on the UD Goblin V2. I plugged the juice channels on the opposite side of the coil with tightly compressed cotton and have used it like that both ways: with and without the opposite air flow channel plugged. It still gives great flavor this way and doesn't get so hot. I found that with dual coil builds on this atty it gets very hot and drains my battery very quickly since I have to run it at double the wattage I like to vape at compared to a single coil.
I build mine (an $11 FT clone), around 0.4 ohms, wick it with Japanese cotton, run it at 40 - 45 watts and go through about 10mls of juice a day. So far it hasn't gotten noticeably hot but the fact it hasn't leaked is what surprises me the most. Functionally, it's a Fogger with double the airflow and better juice channels but both of my Foggers would leak every now and then as would the Orchids that replaced them. These days I lung inhale and the Goblin's enhanced airflow is well suited for it. I wouldn't want to build it single coil as with the current dual coil build a two second pull provides massive vapor, flavor and intensity much like taking a drag off of a good cigar (I vape NET). I don't think I would like it as much if I still inhaled mouth to lung. Instead, I would prefer a smaller chamber and single coil like the well used Lemo 2 (my last single coil atty), that sits idle in the same drawer all the other attys/mods I will likely never use again reside. Opening that drawer is a walk down memory lane, puts a smile on my face every time.