Sounds like it's intended for motors that draw at most 300 watts. You setup is in the area of 500 watts. I wouldn't trust it.
Hobby Lobby has a nice aluminum motor mount designed for the Phasor series of motors. It grips the back of the motor in a hose-clamp like device and bolts on to the firewall.
Scroll down to "Bulkhead mount for Jeti Phasor motors"
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