I can't tell you how to use the feather because I haven't used one. However, if you notice on the video of lynn he takes the lather off, and then adds a couple of small strokes in the area he just took the lather off. I use that same method.

My impression from what the manual says is that you make the firt pass across the grain? It could also be that you make the first pass down, and then similarly to the motion described above you make a couple more short strokes across the grain. Doesn't sound very practical either way to me.

I cannot do more than one pass with a straight as I get too much irritation. I get zero irritation and a close (not perfect) shave on the first pass with the technique described above.

Good luck!