Thats some steady hands you have Stan 1/160s woooo... I try anything below 1/400s on my 150-500 and I get shake handheld.
Looks like a great lens.
And all this time the experts on here have been telling me @ 600mm you need 1/800th to get a sharp shot
Looks like you have it working well Stan and great focus on the eye
I'm quite happy with my 150-500 at those kind of shutter speeds tbh.