Have posted this before but still looking for guidance. Have 1981 Skybolt. Was second built by the builder and overall happy with the babe. Concerned about possible aft cg but now thinking to re-calculate using different datum. Have used leading edge of lower wing since that's was designed used. Weighed aircraft twice from different facilities so that's not a question. Nose does drop distinctly on power on or off stalls so thinking maybe to use different datum. If you have a suggestion please don't hesitate to talk down to me. Keep it simple. Thanks, Joe O'Neill aka Rosie