Very interesting...I trust you're putting this formula to good use not that you're an "official" playtester?
I've been interested in a lower fidelity ACTA model, designed mainly to understand things like the firepower and survivability of each ship - I have a rather simple model (excel based) that looks at mean hits vs different hulls with different defensive capabilities (adaptive armour, dodge, stealth, interceptors etc) but I'm not happy with it yet...