I have difficulty getting my 3-blade VPA's as sharp as I can get my 2-blade broadheads.
VPAs are the BIGGEST no brainer heads to sharpen.
See this.....
'Diamond Sharpening Steel, 8 Inch Professional Extra Fine Oval Knife Sharpener Steel Rod Kitchen Diamonds Coated Honing Steel for Chefs Honing Butcher Knives'.
Can be oval, round, or 3 sided with 3 different grits like I use, makes no matter...
Set the back of 2 blades on the sharpener and pull back, rotate and do it again and again till done. Out of the pack it shouldn't take more than 5 strokes a side. Light pressure till the last two rotations then very light.
Sharp and durable is what you want, not so sharp the edge will roll, like a razor blade. This method will achieve a very durable and deadly edge.