Avenger Dado set

Does any one have the 8 inch Avenger Dado set? I just received mine. I am having issues. Anybody? max
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batwingy in the corners, and the shims are a pain in the butt. If I ever have to do a lot of dados I'm going to get a set of slotted shims or just cut slots in these. Otherwise no issues.
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The bat wings on this set are very deep, maybe 1/16 inch. The bottom of the dado looks like an arc. The sides of the cut are clean but there is no way to get much contact between the bottom of the dado and the edge of the inserted shelf. max

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Sounds like poor quality control. Who'da thought?
I'm no expert on dado blades - which probably explains why I bought an Avenger set - but I wonder if your problem would be helped by having them sharpened. Might be throwing good money after bad, but it might help too. Actually, mine are probably ready for a touchup by now. And it seems like I remember a post from somebody who said that almost any set of dado blades could benefit from a professional sharpening before they're used.
How do the chippers feel when you load them on the arbor? Do they feel loose? Have you tried different combinations of chippers to see if the problem changes? If it's deeper in the center I'd guess the center chippers are a little higher than the side blades.
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Dan wrote:

The guy at Woodcraft said that out of the box the Avenger wasn't very good (passable/use on solids, not veneer) but after sharpening (by a reputable sharpener) they were pretty good. You do get what you paid for.
UA100, who has a set and hasn't cracked them open yet...
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