The stronger nic is an excellent idea for a stealth vape and set-up is top notch. I have the V3 18650 which is quite small, but yeah the 18350 is perfect for your use. Regarding the tank - well you don't need to convince me
Increasing nic on smaller tanks/lower power works great for me
I think people like smaller form factors to be honest. Some of these tanks are mahoosive (althought the Rose 3 isnt one of them imho). It's just a nano kit after all!!
I've been vaping since the stone ages, when we built atomizers out of clay and wicked them with wooly-mammoth fur. Erm, I meant to say, 2009 and 36mg/mL on blu's (but I did use the blue aquarium foam + straw carto mod!); I stopped smoking in 2010 with Super T, ProVari and GG gear... and as the years passed and toppers became less awful, my nic intake gradually decreased down to 3-9mg/mL (depending on what I'm vaping).
I'm not obsessed with tiny tanks and gear, my daily driver sitting on my desk is a Dicodes 6 + Kayfun 5 (in ridiculously tall mode sans ST microtank) or full-size Hussar & Skyline. I just don't wanna carry that around with me. When I'm out in the world, I like gear I can stick in my pocket and use when I need it.
Whatever your feelings about ProVari may be, the one thing I really miss from them, is their P3 connector. I get it, I know how we got to where we're at, but to me it's just kinda ridiculous the direction some attys are going. 40mm ... really? This is a good idea on a 510 connector? And you need 16 coils powered by 350watts because...?
I honestly don't get stuff like this (off the aptly-named broscience vapes:
Voltrove/Modfather 40 mm RTA ... can hardly wait for the ½ liter add-on tank for that. I mean, I enjoy vaping, but W-T-F?
To each their own, whatever keeps ya off smokes is awesome, I personally spend 99% of my time somewhere in the 10-25watt range on pretty simple, spaced single coils, with occasional claptons thrown into the mix just because I get bored

Nearly all of the gear mentioned in this thread, totally shines within that spectrum of use.
I'm just rambling and taking a break from working and expressing my opinions which may differ from yours, no offense to anyone is intended, wishing everybody a great weekend!