First and foremost, do a soil sample. Your wasting your time with the rototiller. Rototilling breaks the soil up and uproots the weeds/grasses and exposeses new seed that was buried. The soil is too rough to plant in unless it is leveled/cultipacked. We would suggest that you mow the area to be planted then rake it off. Wait until a rain then go back and spray the area with Round-Up. After spraying the area with the Round-Up wait 14-21 days or when the area dies off then do a slow burn off against the wind. This will remove thatch and the ash should return some phosphrous to the soil. After burning hit the area with a fan rake then spread lime accordimgly. If you have to bag lime then you may want to disk the lime in. We suggest that if you have to raise the soil ph more than 1 point that you either spray with liquid lime to activate soil buffering or wait until the next planting season so the lime has time to work in the soi. Next, if you disk you will want to cultipack the soil so you have a firm seed bed, then you may plant and fetilize... There are variations to these suggestions according to location...