I have built the F18 pusher and need some help with my prop and gear combo. I'm looking for the best performance out of what I got. Here is what I'm running at this moment.

20 oz FFF F-18 Pusher (Thanks Steve)
1500 Kokam 3 cell battery
2025-4200 Himaxx 5.53:1 gear ratio (6.6:1 and 4.4:1 available)
e-flite 20amp ESC
9x7 SF Prop.

I have good performance with this setup but I think it's just the middle of the road for this setup. I'm new to electric flight and really don't have any idea how to stay within the limits of this setup and achieve more speed and torque. I want to increase veritcal performance as well as top speed.

Any prop to gear ratio combo that can be recommended to achieve my desired result without burning something up would be GREATLY Appreciated.

Thanks in advance