In my opinion, small ships need to outmaneuver big ships. Big ships need to turn slowly... But not too slowly.
In my strange vision of a perfect balance, pilots of big ships won\'t be complaining about their poor turning speed because they won\'t be doing much turning. They will have tools specialized for large ships that play on their strengths, their large ammounts of mass they can throw around, their improved combat range, and their general statistical superiority.
I really want turning and zipping to be a tool for small ships, because it\'s one of the few tools that is so entangled with gameplay that it can by itself dictate the usefulness of certain mechanics, and in a universe of scaling and energy limits, small-ship systems will benefit more from being able to close the gap and keep on target than they could from anything else.
If you make big ships use the same tools as smaller ships (As they do now) then they are nothing but bigger small ships, and both the underequipped small ships and the overnerfed big ships are both trying to accomplish the same goals in the same way.
Big ships need their own unique tools that make playing them fun. I want them to feel like you\'re in a god of the battlefield, and as long as you keep your ship in order and fighter-cover at your back, nothing short of another titan could damage you.
EDIT: Let me point out current thruster/turning mechanics as well. Thrusters only affect your acceleration and top speed, not turning. Turning is based upon a combination of your mass and your dimensions, so having a more compact ship will give you a very small advantage in turning.