OK. so I've had some time to read and watch some of the links that have been posted. So thanks very much for all that contributed. I've come up with the following conclusions from the advice given.
I think the Vivi nova tank system is still the system for me. I like the fact that it is totally rebuildable which makes it cheaper to run. I also like the fact that i can fill-er-up and I'm good for the day. I can take a spare battery and tank with me should i require a new flavour or run out of power. My spinners from vision cut the mustard from my point of view and last 2 days of vaping with great performance and now that i know about the 5-click on/off feature i wont need to fling them out

I now know how to rebuild the coil/wicks and to properly clean the system, Which I'm really looking forward to trying. So thanks to Jsquared and horselady154 for that little nugget. It led me to a video of the same guy doing a coil rebuild for the Vivi nova which was most informative.
I've also learnt that the juice I've been vaping may not have the best ingredients and so am looking for a new cherry/cigar juice vendor from the u.k.(
http://www.e-cigarette-forum.com/fo...scussion/206373-vapenstein-addo-scientia.html)
I like VG prone juices and normally vape 65/35 in their favour so the vape i like may not be ideally suited to the nova and maybe needs mixed with some distilled water.(thanks GetVaked for the tip)
I've also become aware of the technique I've been employing whilst vaping my nova. Sometimes, when vaping I'll try and suck the life out of my Vivi in order to get a throat hit/more nic and I'm sure that if i use the electronics rather than the power from my lungs and let the machine deliver the vape rather than trying to force it out of the the mouthpiece i get less darkening of the liquid. It's rather like dragging the guts out of a traditional cigarette. Now i just keep that button pressed and don't draw so hard on the mouthpiece and that seems to work for me (so far).
So in conclusion:
A combination of better juice,better vaping technique,and a more frequent clean-out should eliminate all the issues I've had with the Vivi nova.
This forum is a great source of information....
Keep up the good work....
One day when i have more experience i may be able to payback the forum by means of some experience based insights myself.
Till then..................................



