I put a Futaba 127 Rx along with a 1650 NiMH 4 cell pack instead of the 600 that H9 sent just for more airtime between charges. Mine balanced per recommended with a 3 to 5 degrees nose down safety margin. I also used a Higley's prop nut and a wooden Master Airscrew 11-6 prop on it along with the Ernst charge jack (all of which is in front of the CG)

If you trust Horizon's figures, Evolution 46NT w/muffler: 16.96 oz. Saito 65 w/muffler: 19.6 oz. That's 2.64 oz. heavier but, I think you'll be fine even at that.

Dave