I currently have four rough-cut rotary mowers all of which I use as HD finish mowers. Accordingly, I keep the blades sharp on all.
I've bought many replacement blades for various brands of rough-cut mowers from multiple sources. All of the replacement blades that I have bought have been "semi sharp" (1/16" or so) as purchased. Still, I sharpen to near lawn mower sharpness before installation. No, I do not hit rocks, stumps, etc., and I do not cut saplings.
Sounds like you need a new source for replacement blades.
I once spent hours sharpening the unsharpened "edge" of a slip scoop to a 45 degree or so edge. Doing so wore out a (cheap) HF 4" grinder and several wheels.
If you hit hard objects, put them on and forget about it. If you do not, get another set or spend the time to sharpen the ones that you have.
Sharp blades cut better and require a bit less HP and fuel.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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