xMackx
Try these three threads. They are well worth the read.
http://www.e-cigarette-forum.com/fo...ystems/295410-vivi-nova-rebuild-tutorial.html
http://www.e-cigarette-forum.com/forum/modding-forum/303173-vivi-nova-modders.html
http://www.e-cigarette-forum.com/forum/modding-forum/284030-wick-materials-safe-vs-dangerous.html
The short version to answer your question is: "it depends"
Each cotton wick substrate has differing wick capabilities and performance. In general, cotton expands significant when wet. For Vivi usage, you need to balance the pinch point of the wick slot in a vivi with the diameter of your cotton wick. Too much.. you choke it off, too little you flood. Candle wick is tightly woven and doesn't expand as much as say cheese cloth. Cotton batten, rolled, or balled has the greatest reservoir capacity and expansion but has no structural support.
I have found that you need a larger diameter cotton wick to maintain enough ejuice flow to the coil to prevent burning, vivi slots are too small for cotton. You can try BJ43's cotton batton overwick technique, it greatly improves performance, but I bore out my vivi head for cotton. It may just be my preferred vaping technique, but I find that cheese cloth is the best cotton wick. Look up Quigsworth on youtube....
It may be OT, but bamboo wicks much better IMO and I like really like/prefer that cottony goodness...
Just my