While I like this in concept, I can see where the method has flaws.
In short - It is an ultimately subjective test which is dependent upon the player's capacity to build an effective ship. One player's ship design principles may be far more efficient than another - And, by these metrics, any generic missile kite will, without fail, have a near-infinitely scaling 'op index'.
I like it a great deal; I see holes in the execution.