I posted recently about how you can improve your loot search luck by rubbing your balls on your mobile/tablet device and then play 1000 games and you will find ultras. Some of you doubted me but here's the proof! All this is just a few days. If you can get a friend to join you in the ball rubbing session then it will double the luck.
My load-out is just epic armour, epic backpack, epic VMP and a fully unlocked Echo Shotgun with all attachments. I then use the scavenger perk adjusted so that every time I get shot I speed up like sonic the hedgehog and no one can catch me.