I want to use a Land Pride GS1560 Scraper on a B2650 tractor to remove ruts caused by heavy rain in a 400 foot long driveway composed mostly of hard clay. It probably had gravel on it at one time, but hasn't been graded in the 8-9 years that we've owned it. Looking for the correct method to smooth the driveway and add some crown to it. Do I adjust the left/right angle with the three point arm and go for it? Or should I leave it level for the first few passes and then add the crown?