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Auto Feature - Plane on an angled surface

Hope I can explain this properly. I have a part with compound angled surfaces that I want to use Auto Feature Plane command on to give me an equally spaced plane. When I do this on a plane that is only rotated upon one axis, like photo below, it works properly.









However, if the slot is angled along 2 directions, I get the below.







Any suggestions to get auto plane to work like in screen shot 1?

Thanks!