I did one of those good form running clinics and they analyzed my gait...had me run barefoot...and had us run to a metronome at 180 bpm. It felt very uncomfortable to run that way at first. Before some of my runs, I would run barefoot in the grass to determine proper foot strike, than run in the my normal trainers using muscle memory to emulate the barefoot running gait.
At the time, my easy pace was 7:20-7:30, but after bringing the metronome on some runs, my easy pace dropped to 6:50 and I then realized how inefficient I was not using proper form.
Regarding forward lean....that sort of fell into place when learning to run barefoot. Your body positions itself correctly so that you can handle landing on your forefoot correctly. I'd also like to point out that hip positioning is more important.
In the photo above on the first post, look how tilted forward her hips are despite her back being somewhat arched. She's setting herself to cycle her legs correctly with minimal braking.
Note: I'm not a huge fan of barefoot running and never owned Vibrams, but learning how to run without shoes was pretty beneficial to me.