Warren, by "turning toward me" do you mean it "walks" on your workbench? This is just the nature of the beast, the vibration of the spinning stones cause it to move. It needs to be mounted solidly. I screwed a board to the bottom of mine and just clamp it to the bench when I need it. And, yes, there are variable speed grinders available. I have an older VS Craftsman model but I use it full speed all the time anyway.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.