[Suicide Junkie]

From what I have heard, the ships (& bases) contribute most to your score.

Therfore, go nuts on research, and retro/scrap your ships so that you have only a small number of Invulnerable ships.

The small no. of ships reduces your score, but the strength of each ship will compensate for the small numbers.

Also, spend all your excess resources on fighters, sats and mines.