Well, I managed to max out every game I've thrown at it. While I haven't tried Chronos yet I'm getting pretty rock solid frame rates in EVE, Lucky's Tale, Vanishing of Ethan Carter, and all the free demos I can find. Admittedly all of those games aren't exactly bleeding edge technology though, so I'd expect them to run well.
Games now a days are no where near as CPU dependent as they used to be. Without the Rift, I can play literally every AAA title out there at over 60FPS, I really can't imagine my CPU being a bottleneck in this instance. My gut tells me your bottleneck is your GPU, even if it's a powerhouse like a 980ti, pushing a game like Chronos at 2160x1200p90 would be taxing on any GPU.
Updating a game's physics and things at 90fps is extremely CPU intensive, so if games are running their game engines at 90fps, that's why you'd need a powerful CPU. You've maxed out those games running on the full CV1 Rift?
So, you're happy with the performance you're getting with less than the recommended specs...Good for you? It is only a recommendation, they're not saying it won't work.