It is impossible to equalize players in a game that is based on player's actions only (but not on math and probability with all possible buffs, debuffs, critical strikes and so on). FL is a blunt-simple FPS in its basics, where you have a ship a gun and skill only to serve you.
To equalize players you'd have to make ships not rely on agility as much, make slow refire guns and reduce their amount per ship and introduce "items" and "skills" that declare your chances to deliver X amount of damage. Pretty much do it like in EVE.