Over the past couple of months, the S and R lobbies have included every single track layout (I think) in rotation. Previously, they focussed on the “full” circuits of most courses, with a few of the smaller ones mixed in.
The downside of the current system is that it appears that each track only cycles round about once per day. If you miss a track which you want to run, then you have to wait a long time. Often, when I look at the list, it is full of oval circuits and smaller club circuits, with there being a long wait to have the chance to run a main circuit course.
My suggestion would be to go back to focussing on the main courses, being present each month, with a handful of the smaller courses then rotating in each month randomly. This will keep the events fresh but will also mean that it is possible to focus on some of the more popular circuits as well.