Hi Xairflyer,
There are a lot of things I can learn from your post even though I stripped my jj1200 many times. Rocking method would be useful to me because the turbine will be changed soon.
Installation of NGV is very difficult to me. On the one hand the position of NGV determines the position of the case which shall align with all screw holes and glow plug collar on the CC, on the other hand, fitting the NGV onto the end of the tunnel affects concentricity of NGV which is very important. So it seems only one position for the NGV. Up to now, I can not get even gap of turbine blades by stripdown many times.

Sometimes it cooled down the turbine wheel was sticky, but I can't find any problem. I think it may be caused by improper gap of turbine blades.