I too have some substantial latency with our Avid Artist. Always have and upgrading Eucon and DR never really helped.
Marc, could I ask you to please try moving the rings by a really small amount back and forth and see if that gets registered on your waveform. When I do that on my unit I get no movement on the waveform. I have an Element Tk where the slightest of touch on the ring would register on the waveform with minimum latency.