Better later than nothing. I have the same edger. What I did to solve the problem . On the edger there 2 metal bars that attach the front wheels. . Remove 1 bolt from each side to allow the arm/wheel connector to pivot. To do this you will have to remove the wheel axle and wheels. ( simplify...
There is a L shaped bracket located on the engine (gas tank side). May need to tip the mower up a little to see it . The governor spring attaches to it. Bend it toward the front of the mower to increase rpms( back to decrease rpms)