Damage = Base Damage + (A's attack × 4 × Attack F ÷ 100) + (A's spirit × 2 × Spirit F ÷ 100) - (B's defense × 2 × Attack F ÷ 100) - (B's spirit × 1 × Spirit F ÷ 100)
This is RMVX's standard damage calculation formula, designed for stats in the quad digits. I'm thinking the game's number crunching will be easier for my team (setting the stats) and the player (calculating stats) if we drop down to three digits, and modify this formula a bit. It's way too complicated right now.
So: what can we use that will be simple, but intuitive? Let's brainstorm.