ORIGINAL: Sethhunter
I usually set up bipes with equal incidence top & bottom but I know some folks like a little convergence (e.g., lower incidence on top).
On a biplane, the top wing has the most incidence, not the bottom. Also, the neutral point is 23% MAC (equivilent monoplane, including area weighting) for biplane wings. I wouldn't do the droop at all, keep it straight, thats my opinion.
I would like to see your spreadsheet, I'm always interested is seeing what other people are doing.
Jan