Right, this stuff I did do:

Turn on TX and RX.
Move trim to center.
Make sure servo horns all as close as possible to the middle of the travel.
Use linkage to center contol surfaces using a straight edge.

Both the aileron and the elevators where pointing up, and combinded with the balance issue it made the plane fly incorrectly. Now that I have everything straightend out I'll go fly again and see if it's close enough to trim on the TX.

I am concerned about adding 4oz to the tail. Is that a lot of weight to make something balance?

schu