Hi,

I am not sure if you would consider using mini metal gear servos instead.

For instant, Hitec 85MG is only .9oz each, and rates up to 61oz, then you can also use micro servo on the throttle.

Loose the big tires, and find some smaller and lighter replacements.

Just an idea...for pattern it's nice to fly around nicely at half to 2/3 throttle, and save the rest of the throttle curve for vertical pull.

Just an idea.