When you rise up the elevator for the boss fight, move your character to the back of the boxes on the elevator. There is a cubby hole corner where two rear elevator crates meet that allows you to take out the rear turret and the other ones cannot even aim at you. Save your heavy ammo for the turrets on the gunships, guns for trash mobs, and abilities for groups of medium armor mobs. If a player is being targeted by the gunship help them out by taking out the turret. Tactics and helping your teammates will increase the odds of simple success.
Heavy ammo finder and scout mods are helpful. If you ever run this strike with me I will be hiding in the cubby hole and won't die to the turrets. Situational awareness helps and don't let yourself get flanked with the large amount of mobs in the boss fight. Good luck Guardians.