something to think about too, in your pics you can see exactly where you slowed down or stopped with the surface cleaner. try to keep a solid pace try not to stop and back up as much,and dont engage the gun when you have stopped moving. everytime you stop, you are leaving the "donuts". i use the steel eagle surface cleaner and will lift the front up, engage the gun, and start moving. then lower the front end so it blends in better and you don't see the "donuts"