Ok, now I know what's going on. First, any 808 prefilled will fit but don't give up yet. Some of the other companies are halo g6, smoov and vapor 4 life. V4l has a lot of different Flavors but the cartos themselves stink because they are not horizontal bottom coil.
Now, the juice you are using is very thick and will take a really long time to absorb. Also, high vg will clog your carto quicker. What level nic did you purchase? What do you mean by "feels more like smoking", in what way?
I suggest this, call vapedudes in the morning and ask them fir 70pg/30vg. Tell them you dont like the 50/50 combo. They will replace it. That's what I use and it absorbs quickly and has a nice throat hit. Remember, vg will mask throat hit and flavor. Personally, I have not tried their 50/50, so I can't tell if it's supposed to be that thick, but I know the 70/30 consistency and that it absorbs quickly into the cartos.