I would keep the servos where they are...the only servo i put toward the CG was the rudder and tail wheel servos..due to running pull pull, plus easier to get to than putting them back in the tail. When balancing mine..i even moved the CG forward about half inch..which required me to put even more weight up front...plan still flys beautifully and moves along fine with a US 41cc and a 20x8 xoar prop.

Bubs