Plug, I have lots and lots of sand and the high lift blades wear out quickly. I go through 3 or 4 sets of blades a year. Lo lift blades would pull less sand up into the blades, thus less wear. I have modified a couple set of hi lift blades but it's not cost effective.
Ford, thanks for the info.
Boyd, you are correct.
If you can't find any, buy a new set of blades and use a bench mounted grinder to grind off some of the top part (wing) of the angled part behind the cutting edge. Then balance the blades. Of course wear safety gear when you do this.
Boyd, I've done that using a thin cutoff wheel on an angle grinder as well as taking some of the angle out with a hydraulic press. They work better but the time involved is not condusive to the price. Thanks for the input.