I've been told recently too not to press my binding in half.
The first binding I did, I was taught as mentioned elsewhere in this thread to put the binding about 1/8" in from the edge of the quilt and stitch it at 1/4" - so 3/8" from the edge of the quilt. That's for a 2.5" strip.
The other thing is just because you had it work with those settings for one quilt, doesn't mean it will for the next. I changed battings and my binding's "fullness" changed - and its satisfaction rating too as a result.
Lastly, I did this binding once - it requires some adjustments if you don't use the 8mm Bernina foot that she does but it does work. She uses a Flat Felling foot. It's probably the best binding I've done so far - not competition caliber but I'm a long way from that for so many other reasons anyway.
Right now I'm happy with "It stayed on."
http://awomanaday.com/2013/01/17/hap...nding-edition/
If memory serves, the main difference when using my Pfaff with a 6.5mm foot is that I can't move my needle "as far to the left as it can go" because that's out of the range of the fold. I had to tweak a little for that but I think otherwise it did work. I'll be doing a binding tomorrow probably and can update if I find anything else that needs to be changed.