Have your broadheads been through animals?
Not exactly what you’re looking for in an answer, but I personally wouldn’t re-sharpen a mechanical head and use the same ferrule to shoot another animal. Even with fixed blades I’m cautious shooting two animals with the same head. With mechs, it’s possible, even probable, that the ferrules and mechanisms are compromised after going through an animal, hitting the dirt, glancing bone, etc. and would still pass visual inspection but next time that head gets shot, there’s a good chance for premature deployment in flight, structural integrity of the head being for-crap and a total breakdown of sharp metal inside a deer that you are going to feed your family or hand the butcher, who you want to keep all his fingers. I know my butcher hates finding expandable blades in deer, and I just shot a doe with a Grim Reaper and the first thing I checked was if there were any bits left in her.