No I am not offended as I hope you are not. Lunging is as individual as riding.
It is something I can just do and Mum said she used to lament that she wished I lunged the horses as much as I lunged the dogs! When I was only old enough to walk.
By individual I mean we would get 2 different outcomes with the side reins on the same holes as we would if we ride the same horse in the same saddle and bridle.
I do not know why your horse was not stretching if on the loosest hole but with one horse with a long neck I put extra holes in the reins to make them longer.
Also it takes a week or so for it to start to work as they relax and learn from the reins, if they have no knowledge of contact. It does not happen in the first or second session. It does not happen with the tightening of the reins. The same as that would not happen in the first lesson with riding.
and I swear this is true. You may not believe it. But he was tense and not relaxed when I lunged him a few times when coming back home. I had ridden and competed on him for years but not lunged him. I was now injured.
He was nearby when I lunged Vinnie. Pepper was out and could have been anywhere.
When I went to do him he was a completely different horse. Maybe he would have been anyway. But I think he actually watched. Anyway it seemed like a miracle that day.