I don't think I have seen it mentioned yet, but make sure the tail wheel is lined up with the rudder and both are set center line of the fuse. Its funny to watch someone with a tail wheel twisted about 25 degrees try and take off, at least its funny till they roll in the pits.

BTW, to reduce the throw if you don't have a computer radio move the clevis at the rudder further out and/or move the clevis at the servo further in.

Ed M.