I burned some fletch one time and they shot great- until I shot at a deer with one! Most arrows are pretty silent; but fletch noise can get their attention!
I shot at a buck with that first arrow; and it dropped and the arrow missed it. The buck looked at the arrow and took off back the direction where it came from.
A while later it came back by my treestand on pins and needles.
I shot another 'flopper' at it and hit it- but the angle of the arrow kind of tells the tail of how it could hear the arrow.
I was shooting from a treestand; hit it on the bottom of its chest; the arrow came out over the top of its shoulder; and went into the ground. As the buck took off- it broke off the broadhead; and about ten inches of arrow: that was buried in the ground!
After that I learned to shoot new fletch shapes where I could hear them ...before hunting with them...
I don't think notches would work; maybe barely burning the edge of a fletch would create a 'feathering' like you described- but most popular shapes are quiet enough to miss and not scare off the animal.... not that 'I' know that for sure :rolleyes: