I think I know what you mean, and I am using the same concept in my game :
http://s23.postimg.org/vis7er9kb/ship_viper_stats.png
http://s28.postimg.org/84bek3upp/bmshot_stats.png
This two ships have diferent status, the red one is more agil, the blue have more fire power.
Since fire power in my game will give the player highest score, this ship is more expansible and the status are calculated using percentages :
That way everytime I want to create an new ship, I just play with this values following this rule, and I will have ballanced ships.
You can use the same logic in your game, its working fine for me.