Firstly what is ##### supposed to be??? How can I read your post if your using some word which is not permitted?
Next I've had the 80-400 for 6 or 7 years now, together with my wife shooting wildlife here and O/S. I've had a camera in my hand since I was 12 and I'm now past fifty. I think I know how to pan. Yes I use the AF button uncoupled from the shutter button - no I don't prefocus unless there is a good reason, the AF needs to be good enough to manage movement, thats what the little c on a Nikon means, continuous focus.
If you look at my earlier posts you can see what I use - all Nikon - no aftermarket stuff. Been burnt with a Tameron many years ago and will never touch another 3rd party. I dont care if their supposedly better or gold plated, just not interested full stop.
The VR doesnt work well - its adequate, its slow - have a look at a new telephoto like the 400, 500 or 600 then you might realise how good it gets.
Maybe I expect more from my gear, especially when I start comparing it with my 500 which is in a class of its own - maybe your satified with less than I am willing to.