The only way I have been able to get it to work to an acceptable degree is to first centre the VR view, then without physically moving my head, use the view keys to bring the boresight into alignment and set it. I can then reset the view and I'm in the ballpark at least when using the guns or slaving the TADS to the CPG. I do the same front and back seat and, while not perfect, if I do it carefully it's about the same as I get with a hot start without boresighting. Might just be an issue due to the imprecision of VR