White lance is much easier just to use two Moonblades and a quick mech to boost past everything and blade the white ship. It took me less than 30 seconds to complete the mission with almost no damage taken on hard.
Also the SIRIUS cannons are much better for fighting the fast-moving mechs on a few stages than the OGOTOs as suggested here.
400,000gs reached 1-13-15. Used D4 to get it (get it, it has 4 in the name) due to my disgust with how Halo: MCC has been handled. Achievement used for 400k milestone: Business as Usual.