Mounting the servos in the tail is definitely easier, but even with the big battery, you'll still have to add a lot of weight to the nose. WIth 12 Oz of lead on the nose of mine, the OS 1.60 still pulled it vertical forever. Now, at 13 oz lighter, I can't wait to see how it flies. I still have my batery mounted on top of the motor box, have a heavy APC 18x6 prop and a Tru-Turn spinner on it, and I'm sure that helped the balance some.

It seems that the CG in the instructions is pretty conservative. If you look at the Protech Staudacher, which is exactly the same plane, they recommend between 5-5 1/2" back.

One last thing (or 2) - Get rid of the flimsy spring that holds the wings on and get a decent one from the HW store. The supplied one is too weak, in my opinion. The ends of mine deformed (stretched out of shape) when I put it on. I also added aome flying wires to the tail to give it a littel more strength. Haven't heard of anyone else having problems there, but it gives me a littel more peace of mind....