A while back I purchased two Wetterlings. One 19 inch Hunting Axe and one 26 inch Small Forest Axe. They came with a secondary factory bevel but were pretty darn sharp. Now, i'd like to get them in shape for maximum performance but I've read a few accounts of secondary bevels and also zero grinds on axes. It would seem like a zero grind leaves less material behind the blade and makes for a slightly weaker edge. Should I keep the secondary bevel and broaden it? Make it convex? What is optimal?