I've noticed that on my bike, in neutral, Closed Loop stops just above 2000 RPM. Perhaps lighter loads exit CL earlier than I've seen.
This could be a difference between Closed and Open Loop areas for the RT and GS models. I can tell you for sure that my RT remains in Closed Loop up to something like 6000 RPM and at speeds over a hundred miles per hour. I've got lots of plots and data showing the Closed Loop status (GS-911) and AFR (from the LC-1).
Can you connect a PC and get a running log of the data. (I strap my PC to the rear seat). You run with the serial cable connected and a program you got with the LC-1 called Logworks. That will tell us a lot.
If you can, try running the same test with the Pink Coding plug instaleled (30-87-87a) we could figure out whether it is coding plug related, or whether the difference is my MA 2.4; or whether it's something else.