Basically any 2-in-1 laptop will use the XXXXU (ultra processor) which runs was designed to not be as power but runs cooler and has more battery life. The best gaming machines have more powerful processors and less battery life 5 hours is good for a gaming machine. Most gaming machines are heavy. Now a machine that fit your criteria more than most is the Dell XPS 15. I didn't see where you can configure 16 gb of ram and the battery life isn't 8 hours. Kaby Lake is new and I think the OEM are waiting because of some of the Sandy Bridge issues when it was first released. I look for more Kaby Lake systems in spring of 2017.

But if i have to pick one I would say the Dell XPS 15