I think i advised some tactics in a previous post about dealing with the fracking Legio toasters:
First, if you like Scalar Tech Solutions aerospace doctrine, you should DEFINITELY grab a Percale phase cruiser and outfit it with Spindle ion weaponry. You know, ion Baste discharger and its small and large variants. Legio droneships are too fast and too tough to win against them in a protracted engagement, so it is almost essential to utterly destroy them with an ALPHA ION STRIKE. They will invariably flameout, shut down weapons and become siting ducks for you to scrap easily. The Percale high energy focus ship system is a great boon in this tactic.
Second, if you want to face them with vanilla tech or other faction, adapt a similar tactic. The Phasegon (a phase Paragon!!) is even deadlier than a Percale. Outfit it with 4 ion pulsers, 2 tachyon lances or gigacannons and a bunch of burst pd and they become crippled with one salvo from P-Space!
Good luck and good hunting