Thank you for asking, SuperDave! I'm really enjoying a Vivi Nova on my (well, originally, your) P+650, but the original slant cap requires a shorty 510 extension to use it without cutting off the airflow and/or wobbling. Functional, but inelegant solution.
And truthfully, I'd rather have a piece that matches the precise (well, for lack of a better word, precisely) instead of having a gap. Though I suppose either option would satisfy my twin requirements of better airflow and bringing VW/VV 18650 goodness to the P+.
Been neglecting the little guy lately, and I'm falling in love with the precise all over again. Craftsmanship, design and utility of it is unmatched. I may dally and stray from time to time, but I'm not EVER giving up the durability of the precise! If for no other reason, it will be indispensable if Uncle Fed ever jumps in and starts the vapepocalypse.
In the meanwhile, I'll have to ponder if I should get the existing kicklet flat cap, kicklet for the Kick, wait for the new part, etc.
Thanks!