I have my elv servos just under the stab.
I used hitec mini high torque 255's

I too have a Saito 1.80 and put hitec 605's in wings and a 5645 hitec on a pull pull rudder.
I have my bat. mounted where manuell tells and plane bal. true with no extra weight added, total at 11.5lbs

This is by far one of my best planes, just a pleasure to fly, with more than enough power to do with as you like.