1.7V on factory (any?)air would thermally throttle the chip in a heartbeat. Clearly that is an anomalous reading (we always say not to trust software!).
The stock intel cooler is, surprisingly, tough to mount properly. If you push down firmly on it, do temps go down? Is the heatsink warm/hot to the touch when you are seeing 90C?
Side note: 1.4 or so for Haswell is fine 24/7.