If you do the math on the wing and CG, you will find that 5 3/4 is about 35% of MAC. Just about right for 3-D type flying.
I tried to install pull-pull on the elevators. Did not have good results. I ended up using MK Elevator Bell Crank. I get over 65 degrees deflection up and down with zero binding.
For more details look at posts # 12, 13, 14 & 24, 25, 26 in this thread
http://www.rcuniverse.com/showthread...hreadid=319573
Another solution might be to mount the servos lower in the fuselage to give a greater angle on the control rod..