If you designed a cooling inlet up front for the battery and have an exit below the elevator, why opening behind wing? If that is needed, did you experiment with opening on bottom or sides due to airflow?
How about getting rid of 2 aileron servos and mount one inside? Less drag?
Look at securing wing and not using rubber bands and pegs?
Play with changing wing angle a small amount. We use to race 1/2 A's and this help reduce the CD and made it a winner.
Need to explore prop size and pitch so it will unload in the air. Take a look at APC's prop.
It is all about reducing the drag, even on 65% nito Formula One's, we scotch tape the wing at the fuse to reduce drag. Highest radar speed we got was 207 with a modified wooden prop.
Some interesting topics...
Everything I've done has been run through Ecalc in advance, and I've been tuning drag coefficients based on radar runs. Looks like the stock Speed Deamon has a Cd of ~0.3 using frontal area, with the Super Deamon slightly less. We've been running APC props exclusively since the second plane was trimmed out.
Since the servos are flush mounted, there's little drag to be removed from putting them inside and running torque rods. Plus I find it pretty telling that the F5D guys have moved away from torque rods to wing mounted servos. Torque rods are a packaging nightmare since they get in a fight with the battery, and slimming down the fuselage cross section *seems* to be more important than eliminating exposed pushrods.
I put the exhaust in the back since the GP Rifle and several other planes use it, however the latest Super Deamon version doesn't have it or the NACA duct. Instead I put airscoops on the sides to blow air over the motor casing, ESC, and battery, and then out the tail. It still gets hot as blazes in there.
The wing bands remain a problem and I'd like to get rid of them, but gluing the wing on is a weaker structural setup and leaves me with the problem of battery access. Right now I don't have to velcro the battery in, allowing a tighter fit in the fuselage, but a bottom hatch would require that and then I'd have to deal with keeping the hatch secure. A pain in the neck to say the least. Many of the top F5D planes eliminate this via removable nose with a battery tray, but I don't know of a good way to do that with foamboard without either making the plane disposable after the first less than flawless landing or increasing the fuselage cross section excessively. Plus we still haven't gotten around that wing security issue.
Of course there is one end-all solution: bolt the wing on, using plywood hardpoints. Not ideal for a foamboard plane that I'm trying to make accessible for others, but I'm warming to it after all the problems I've had keeping the wing in place on my 64" Hot Deamon.