The Aqua is a great vape and damn sexy in hybrid with the Origin.
Although I enjoy it, I tend not to use it regularly because of it's small capacity and lack of being able to see the liquid in the tank. That, and I just have to many other vapor toys.
Mine seems to be it's happiest around 0.5Ω. I run dual coils at 5/64" wicked with cotton, which is a good size for the wick channels.
Leaking is a non-issue if it's wicked correctly and flooding after a fill is not a problem once you've mastered bottom filling it.