I doubt its your setup at all if were talking about a regular rolling circle. I can do rolling circles with just about any plane (including trainers). My thought is (and I have this same problem when trying new stuff) that though the simulators are great, things are a lot different when you have the real plane doing the circle. I dont know which direction your trying to do the rolling circle to?? Typically its a lot more comfy to go counter clockwise, rolling to the outside. Once you get that down then you do it the other way then figure 8's then point rolling circles, then one roll per circle (my one roll per circle is still a bit sloppy but it looks awesome in the sim)