Fixed 2-blades, like the Zwickie, Eclipse, STOS and several other good ones, are as easy to sharpen as a knife and will provide the highest odds of pass-through on all game and in all circumstances. But I'm guessing you're using aluminum shafts? Some of these are available in screw-in. The best component head I used back in my aluminum days was the Thunderhead 125 3-blade. Killed deer real good, but had a couple of tragedies with elk. Whatever you switch to, it will be an improvement! Good luck.