The great thing about traditional archery is that there is no ONE way to do anything... it lends itself to many approaches that work, depending on one's definition of "success".
I had trouble with the double bevel. Got the KME. Ron talked me thru it.
As Steve pointed out, I was getting frustrated with the coarsest stone and switched BEFORE I raised a wire edge... bad juju!
Once I got that thru my stubborn head, things went better. FForward to Single Bevel. Same thing. Have to raise a wire.
When you have the unbeveled side showing a wire, taking off that wire actually "sharpens" that side a 'wee' bit! Not a true double bevel, but think about it, you have to get that wire, then the wire off, so it's sharpening the other side too!
Recently visited a friend who had trouble with some Grizzly heads getting them sharp. I had trouble with the old diamond stones years ago and got the new ones from Ron..Wow!
I had his heads very sharp. He was amazed! Whatever he was doing with another brand, there was just too much variance between strokes where the KME keeps a very precise angle using the knife or Broad Head sharpener (I have and use both).
Good stones, aggressive cut, removes metal. Often the bevel isn't exact or uniform on most affordable heads... that black marker really makes a difference in seeing what needs removed or where it's being removed.
I strive for 25* setting, but sometimes it creates a "compound edge" cause the original bevel is say 30* and only the very edge gets the 25* which is fine...
Good luck!