Blab, when my Jota arrived from Pommyland, it seemed OK but felt like it would would tankslap at only about 80kph when I backed off after a quick start unless I did the grip of iron thing. I panicked about all sorts of possibilities, but a mate suggested balancing the wheels and tyres. I did, and the problems completely disappeared, bike was rock solid up to any speed I was prepared to go to.
Even though everything's all new on yours, something as simple as a balance weight falling off could account for the problem and be one of these things that just happens. Fairly cheap and easy to try, anyway.
Ken