Hudson,I have the same plane.I used the AXI 2212-20 on 3-s with an apc-e prop(not the slo-fly),and climb+ speed was very good for this plane,however,I to wanted MORE performance,so I put a 4s pack in,dropped dn to6.5x6.5 grapner "speed prop"and speed went way up with a slight decline in verticle.Still not quite satisfied,I put an AXI 2808-20 in and ran it on 4s with a 7x6 speed prop and wella---performance is nothing short of SPACTULAR!!!!!
In your case,I'm not sure,but if it were me,I'd try dropping the ratio to about 4:1 and start playing with different props--do not use "slow-fly props" as they distort at high RPMs and will actually use more amps than an equivelent "e"-tipe prop.If your really looking for speed,forget APC props alltogrther and go with carbon blades---very pricey though,but then speed never comes cheap!!! Here's a pic of my F-18 in the back yard with the original set-up.BTW,I think your gear ratio is meant fot slow-flight and 3D.Of course if you could hover that thing---what a gass!!!!!!!