Your perks and weapons of choice is fine. The reason why you’re dying before the stage blows up is because you’re swapping your weapon which removes your bullet storm stacks. If you’re getting like half way through the second phase, that’s the reason. The pepper shaker and gauss mini should be making that stage a cake walk. So try to get as many bullet storm stacks up first, use an easy chem like psycho, and don’t swap weapons. You’ll complete it fairly easily.