Yarlen, I hate to disagree with a dev.
 
However, I sent a 50k pirate raid at my son.  The pirate's fleet strength took up the entire bar on the planetary enemy status bar.
 
Yet I can still only send a "weak" fleet after that of less than 25 ships.
 
And this was three hours into the game.
 
Really, Yarlen?  How long must the game go on before one can send a severe raid?  Days?