You might be able to get away with the DA-85 in the Edge, but it'll probably fly heavy. I'd get rid of the Edge and buy a 33% plane or sell the DA-85 and get a DA-50 for the Edge. Lanier has a 94" wingspan Edge that is designed for 80cc range motors. You can read more about it here:
http://lanierrc.com/airplanes/lana1187.html
I have a GP Christen Eagle II that is for sale on the swap page. I flew it with a Fuji 50. Make sure you have the plane balanced correctly. Mine came out heavy with the Fuji 50 in the nose. Also, as someone else said, ditch the Zinger prop. It is garbage. I flew with one for a few flights. I wasn't getting the power I wanted, so i switched to a Xoar and I am happy with the results. Also, strengthen the firewall if you haven't already. A 64cc engine is a lot of motor for this plane.