A month or so back, I bought a KME to attempt to conquer these simmons heads. The system is unbelievably consistent, but some how I just couldn't get the simmons heads sharp. I did use it on a few knives and some non concave heads and I don't believe anything could work better. Well, I know it couldn't work better, it could only math perfection. But I still could not get the simmons head "hair popping sharp". I could get them sharp, but not razor sharp. A friend used a razors edge and told me to try it out. I purchased one and it is the answer for someone who struggles like myself.
I slid the broadhead down my arm last night after trying it out and shaves hair full length of the blade. There is a flaw in the Razors edge, though. The more you sharpen your heads with it, the greater the angle gets on the guide. I am sure this isn't that big of a deal, but it is something that I think will need replacing in the future. I did it just as Chris Spikes showed and it worked flawlessly.