I have a PR18 Bluebird with flail blades. I've done two seasons of spring clean ups but I still don't know what the difference between power raking and dethatching is. This is my problem, the new spring season is coming up and I only want to fluff up the grass and get a minimum of thatch out. I feel that with the flail blades I'm taking out WAY TOO much dead and live grass. So I'm thinking of switching to tines. With tines on, is it still power raking? and will this do a good job making the lawn look good for the power raking season? How much is a tine roll, whatever it's called? Have I been unintentially dethatching the first few spring clean up seasons?