Playing as Xeloxi is ridiculously easy.
All you need do is attack one of the heavily defended anomalies with a basic survey vessel and weakest ship.
This exposes the huge pirate ship and supporting fleet.
For a mere 15 control you can then enlist the pirate fleet.
Since your unarmed survey vessel survives the fight, you can replace the tiny fighter with one of the pirate support vessels and send your free huge ship with support fleet off to slaughter the enemy.
Since the anomaly's heavy defence respawns every turn, you can repeatedly attack, enlist for as many huge ships as your budget can support.
When I bumped into the Mimot they already had 15,000 points and controlled 3 sectors while I had not yet taken one.
I had to conquer two sectors before I met them face to face, but my free huge ship supply was such that I could ramp up firepower faster even than the Mimot who spawn two ships for the cost/time of one.
Methinks this is an unintended "feature" though it is also the only way I have ever been able to beat the Mimot after they develop slipstream travel, though it is still a hard slog.