I personally really like temperature control coils, but don't think that the GS line is particularly well suited to it. TC is more designed for Sub Ohm and high wattage vaping, IMO. With a tank like the GS Air M, where I never got burnt hits and very rarely got dry hits anyhow, there's no advantage to it... the coils and tank simply aren't rowdy enough to utilize TC vaping. On something like a Kanger Subtank, TC is a godsend and really takes vaping in a whole new direction... but the tank is powerful enough to take advantage of it.
Insofar as your juice goes, I'm not certain I get what your ratios of PG, VG, and water are... not sure what you mean by mixing 45/45... but 10% water is pretty high, and that might be your issue. If you blended a 70/30 with a 50/50, then added 10% water, the resulting juice should be about as thin as pure PG. However, water doesn't vaporize particularly well in attys, especially if there's already PG in the mix. I never go above 5%, myself. 5% water added to 95% pure VG gives a consistency like a 30-40% PG juice... slightly thick, bit thin enough to wick well on most setups. If you must, 7-8% gives aboit a 50/50 consistency. I'd never recommend going higher than that.