I would move servos to the rear, starting with the rudder.

When I build an ARF, I install everything except the rudder and elevator servos. Then I check the CG. If it is nose heavy, I tape the rudder servo in front of the fin and try. If that doesn't do it, I tape the elevator servo on. Usually this does the trick, but I have had to move the battery.

I cut the hole in the top or side anf glue in a little piece of 1/16" ply or 1/8" lite ply, mount the servo and that's it. You do need a servo extension lead.