You might look at a sling blade or kaiser ax as they are known. The swedish ax possible might fit your bill. If you are looking for a machete look for these features. A nonslip handle that is bolted, a high carbon blade and a thick spline. If you can flex the blade from the tip to the handle then their is more of a chance for deflection. Remember to put it away cleaned and oiled it will cut much better than if it is rough and rusted.
Art