I remember awhile back of my Trex tail pulsing like that when it was new. I did have to very very lightly sand the shaft, and then I used some Tri-Flow on it. That solved my problem, but there is lots of variables as you know in which could cause this.... Your guess is as good as mine...

I always hate new parts or a new heli for that matter, as everything is stiff and brand new, and I start to like everything much better once it all gets broken in and such.
Funny, as I was just up top of the property pacing, and waiting for the wind to stop which it never did, and was just thinking of you and your loops and such as I was staring off into the sky trying to imagine if I could pull of a loop.... Which there's no way yet... But yeah, whenever you get a chance throw up another video as you progress a little more... I also was thinking the other day, when you are filming and you had the issue of the heli out of frame are you zoomed in to much with the camera ? Reason I ask, is I film all my flights with two clicks of zoom and that's it... It keeps it perfect so, its not to close and out of frame, and also not to far away also... I tried 3 clicks this morning in the heavy drizzle, and it was to much... The Typhoon would sometimes be out of frame...
Worse comes to worse get one of those harnesses from Home-Depot or somewhere, and use the industrial strength velcro, as the camera is right there at eye level and so everything you see is also exactly what the camera see's. Being on top of your hard hat might be making it a little challenging. The harness is neat with the velcro, as you can still tilt the camera to a degree or two for those perfect shots... Just some ideas...
Well I miss my Trex, so I need to start working on it....
Take care Jim....
~ Jeff