My first concern is why are the broadheads not sharp from the factory? I have watched videos showing how to sharpen the broadheads. They don't get sharp.
I've had a couple packs of Rages that the blades were stamped, but never sharpened. The Rages blades that are sharp, will lose their edge in a quiver insert, if you aren't checking them.
I quit using G-5 Montecs because I couldn't get an edge on them that I liked. I thought the steel in them was a bit brittle, as I broke a couple heads on stump shots into rotten trees and soft ground.
My Slick Tricks - always scary sharp out of the package.
My experience as well.
I routinely use Slick Tricks for fixed heads, and the Rages for expanding, and have had good results with the NAP Killzones.
I think some of the sharpness is lost in the packaging, seems like some broadheads can rattle and contact the blister packaging, which I think can take and edge off over time.
Nothing scientific, just impressions over time, trail, and error.