I am liking the new Vivi Nova's right out of the box. There is break in period. seems every atty or cart has one, but then they vape like mad.
Vision Vivi Nova, Part 2 - Changing Wick (COTTON) & Final Impressions - YouTube
The new 2.5 have nr wire for the legs and you are going to want this when you build your own. 1 fellow solves the problem by bending the legs to double them and twisting them. This lowers the resistance on the leg allowing the heat to build onlt on the coil. I haven't tried cotton balls or gauze but I will.
I use the stock coil before building a new one. You might pull it and replace the silica wick with twisted gauze or cotton right off the bat.
One last thought. When you twist on some nr wire, you make it stiffer and it just wants to go straight down, possible shorting out on the sidewalls .You can always run the wire to the same side of the connector instead of opposite
sides as seen on the video. 1 can touch the side, it's negative anyway... I've seen copper used for the legs but I'm not sure that's good in our atty's, copper and cooking, been a while since I put a penny in my mouth..yuck