IMO you should just get a ProVari and kayfun. You won't regret it. I've been through a lot of devices and toppers and my favorite combination by far is the ProVari mini with extension (because I prefer the look of the teardrops) and KFL+ V2. Hits like a dream every time. Micro Coil and cotton is also the only way to go when it comes to a kayfun IMO as well. Also, when (because most likely you will) you order your ProVari, do yourself a huge favor and get a beauty ring.
P.S. I didn't read through the whole thread so take what I said as if I only read the original post then replied.

P.S. I didn't read through the whole thread so take what I said as if I only read the original post then replied.