The 360hz monitor display a new frame once every 2.778 milliseconds. The 1000hz camera records a frame every 1ms. So just from these two factors, a single test could be off by as much as 3.778ms.
You calculate your average from 10 tests. This means that on average your final results are off by 0.3778ms.
How then can you confidently report a 0.1ms latency for the Corsair K65 RGB Mini?
Am I misunderstanding something? Have you updated your testing methodology to allow for greater accuracy?