Have you considered the E-Flite outrunners? I hear they are very well received and have awesome power.
I don't get it, how can you be using a 650kv motor on 6s2p? This SHOULD be getting you over 50mph then?
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens