220C is 428 Farenheit. I set my TC vape at 400F with all my juices. I don't notice any faster coil gunking. I re-wick about twice a week and clean up the coil, but there's no appreciable accumulation, just a little crusting that comes right off. I just like that clean Kho Gen Do wick taste.
Most of my juices are translucent, not cloudy or opaque. My darkest ones are clear orange or reddish, but I can still see through the
juice in a glass bottle.
I use Ethyl Maltol as sweetener.