I went with all standards - Futaba S3003's. For CG considerations, they are mounted per spec. Flight battery is between the fuel tank and the servo's down low and the Rx is tie-wrapped to a small platform I installed just behind the cockpit. That arrangement eliminated the need for any additional balancing weights. Tip: Reinforce the ABS cowl with FG tape and epoxy at all openings and cutt-outs and around the inside perimeter where it attaches to the fuse. Over time, it cracks without the reinf.

Ted