Crashland:

Sorry . . it's been a long time since I owned my Slow Poke Sport 40, but I'm certain I didn't have to add any weight anywhere. If you haven't already done so . . . consider moving airborne components (battery, and receiver) to locations that might solve your balance problem. I've occasionally used a battery with larger cells (heavier) to help move the CG to within the recommended range. Good Luck.

Dean