US Sales Manager for Eagle-Gryphon Games
House rule suggestion ... based on suggestions I have read before regarding this ... granted I haven't tried it yet but plan to the next time we play because I think there can be a problem with the first player to upgrade the flagship running away with the game ... Contrary to the rule in the rulebook, when a player's flagship is destroyed the player loses the upgraded flagship (it is removed from the game) and reaquires a starting flagship (the ones with the instructions on the back). See if that works.
I used this house rule in the game I have played, more for a thematic purpose, but it did cause the first player who gained an upgraded ship to lose it a few turns later.
However, the second person to acquire an upgraded ship still ended up running away with the game.