yeah, for the apache it is trim up and it should force trim the stick into its new position.
it works for every helicopter I have tested so far. make sure to set force feedback active in the general settings of DCS as well.
maybe your base settings in the VPforce software are too weak to keep the real stick in position? not sure. I am new to the Rhino as well.
green bars show the active effect in TelemFFB, yeah.