You should probably static balance the wing uncovered as close as even as possible,by sanding away[X(] the heavy end. After adding Monokote, Control Surfaces and associated hardware, rebalance it, your adjustments should be minimal at best. Then of course you do a lateral balance on the plane fully assembled, RTF minus fuel. Again doing the balancing as you go insures a minimal correction as you go.
Is that pretty close to right Major T?