Hello,
please share your configuration file. Without knowing value for Geometry 6° I dont know if it is correct or not.
If not, it can cause many problems with cyclic performance.
Even that you said it is configuired to 6° this configuration can be incorrect, because it depends where and how this angle was measured and if 0° was set really well.
If 0° is not correct, then resulting value for Geomery 6° can be for example 10° even that you measured 6°.
This guide can help you to set Swashplate really well from the beginning:
http://manual.spirit-system.com/index.p ... tive_PitchElevator Filter at 4 is required because 600+ class models are quite heavy and elevator can't stop instantly as fast as smaller models. So the elevator movements must be corrected by unit.
If tail is not working well and is not holding even with Revomix at 4 something is seriously wrong in the mechanics or base setup or RPM not holding too well.
With your settings file (4ds) that you can save in the Backup tab I can check it all.