My Split is fast, powerfull, precise, predictable and damn near efficient. This is why...

1) Sand the nose down. WAY down. The split is about as aerodynamic as a mack truck in stock form. Also spend lots of time rounding out the aft sections. This is important when dealing with an underpowered air frame.

2) The wing comes out of the box warped. Flatten it out and glue 1/8" carbon strips from tip to tip right down the CG top and bottom. This will make your wing absolutely rigid and keep your ailerons from doing unexpected things during flight.

3) Take time to flaten out the ailerons as well as the horizontal and verticle stabs by hand. Cover the currogated leading edges with some Zagi tape (or boxing tape) so they don't act as little air brakes.

4) Throw the speed 280 in the garbage. Sacrifice a bit of flight time and wake the plane up a ton! Use a speed 300 or Wattage S370. I used the 370 simply because it was a dollar cheaper :\

5) 5 minute epoxy the motor to the fuse. Do not tape it per the instructions. The can will become a structural member of the fuse.

That's all I did. Spend a little extra time up front and this plane will perform. My Split climbs out steaply after a gentle toss and gains altitude FAST. It will do huge, powerfull loops from level flight. Rolls are precise, tight and quick. Inverted flight is stable and requires just a touch down elevator. The flight envelope is enormous! Fast and darting at full, but slows to a walk for landings. This plane has a ton of potential. Round everything off. It makes a HUGE difference.
Efficiency!
Oh yeah. The recommended CG is a bit too aft. At 55mm from the leading edge, the plane will have a nasty tip stall. Mine is set at 50mm.