Vapor always looks better on camera than it does from a first person perspective. I notice this while vaping and watching my video feed on Skype. Just sitting in my office blowing vapor at the white walls, it's a lot less visually stunning. Don't sweat it....you see people blowing apparently impressive clouds of vapor on YouTube because that's what they want you to see.
The Subtank mini is a hotter vape, particularly if you're used to a Kayfun. I think it's because it's less "meaty" than a Kayfun. Less material = faster heat transfer, especially up that very thin, wide drip tip. Occasionally, the drip tip on mine gets hot enough to be uncomfortable. Swapping with a Kayfun drip tip seems to help, or you could get yourself a longer drip tip. That should cool the vapor down a bit more for you too.
Had my mini a week and I'm already used to the hotter vape, though I can't say I favor it. I'm struggling more with getting good mouth to lungs...