All my life i have used front tine tillers, mostly old used ones. Sometimes they were a little rough to handle. I finally took the plunge and bought a new troy built rear tine. This thing is like wrestling a bear. I have locked the wheels and adjusted the rear bar and tried to follow the directions. It lurches forward at times, dragging me with it. Once it lurches forward, you can't let go of the handle. There is no way I could walk beside it like the picrures show. My garden is very loose, so I know it isn't hard ground. Any ideas?