Are you sure the recommended is that far back? That seems like alot. I thought it was like 2.5 back or something like that.
I have them mounted at recommended, and I really like them there. It would take alot for me to mount anywhere other than recommended. It's recommended for a reason. All of armada's team has skied on them and then they decided where the best point is to mount them. The swing weight is already lower because of the Elf Shoe, so i don't think you would be able to feel much of a difference.
As for tree skiing, they do okay in the trees in the east, where we don't get much snow, but anything out west would be too much for them.