Probably the best way to go would be to get one of those medical chairs that doctors bolt your head into so it dosen't move. You'll get the sweet spot every time. If you go this way, though, it would probably be best to get gear that has remote comtrols.
Listening chair suggestions
I now have a dedicated listening room and I am searching for just the right chair to place in the sweet spot. I'm considering a recliner or maybe one with an ottermen. I thought an ornate barbers chair might work but it seems difficult to transport. Suggestions are welcome.