Hi, When using force feedback with curves there is an issue with trimming. If you trim the stick will move to where the linear position of the stick should be (no curves) which makes the stick extra sensitive. This is an issue especially in the helicopers, su-27, f-5, mig-29 where trimming is important. I can trim all the way down in the su27 and it will be super sensitive and still climb at a low speed.
An easy demonstration of this is with the the huey or mi-8 with the force trim button. If no curves are set you can press it and the stick will stay in the same place. But add some curves and the sick will move out of trim.
This issue needs to be fixed for ffb. Lots of people still use ffb and it ruins the experience.