Camping in the nightfalls is kinda the only way to actually beat them. Its like LASO in Halo. Your best bet is to take your time and be as safe as possible. Cheesing raids is just saying "This is too hard, just push him off, its faster anyway." It cheats you out of the experience that is the raid. All of the struggle, desparation, close calls, and the joy of victory in a perilous battle.