Welcome to Vapor Talk Gunner. It sounds like the juice is not getting into your cartos in the tank. Did you prime the carto first? ( add about 20 drops to the carto before filling the tank) Sometimes a juice with a high concentrate of VG doesnt wick well into the carto.
I can't believe it's been 3 years already. Vapor Talk was the first forum I joined when I started vaping my NJoy NPro, and I never left. Thanks to Christopher and the fine members here. I've had a blast hanging out with you all. :hugs:
Sometyimes we forget that we are just a very small part of the e-cig market. There are many more that just buy the standard kits and either try it out and go back to smoking or stick with it.
I have not used the Vision one. I have the Kanger T2 ( eGoCC) clearomizer http://www.theveteranvaper.com/ego-2-4ml-cc-changeable-coil-clearomizer-clear/ and have not had any taste issues
Most likely its carbonized burnt liquid. If your carto is spitting hot liquid and producing black specs I would say its running very hot. Time to throw it away and try a new one.
I use these on my eGo & my Provari: http://www.sweet-vapes.com/shop?page=shop.product_details&flypage=vmj_color_plus.tpl&product_id=1156&category_id=39