hexblade,

Before you start banning stuff, think in terms of evolution.

Only allow the loser of a battle the option of redesigning their fleet for the next battle.  The winner is forced to keep their current ship designs.

The real reason that you lost was that your opponent was able to out-design you.  He guessed that you were going to make a really big ship and he designed his ship to take it out.  Had you fielded numerous small ships or carriers, it would have been a much different outcome.

If you allow evolution to occur, you'll see a myriad of designs evolve that will be balanced against each other.

Mike Z