Not sure what the problem is. Did you try the High Speed Stream? [I've been running at "modest" data rates, a few kHz, and not had problems with "ordinary" Streams].
If you are coming to NIWeek 2019, I'll be giving a talk, "Using and Abusing Channel Wires", so there should be a number of "Channel" enthusiasts in the room. This Forum was very active when Channel Wires were being developed, but (as you noted) has fallen off in the last year or so.
Feel free to send me a Private Message if you have further questions.
Bob Schor