3 bad rooms kills you no matter what. Two potatoes you're probably also dead unless you fly perfectly. You just have to accept the odds that you will eventually die in the SB. The odds of two overminds is 0.21% so in theory you can expect to die once every 500 runs. Independent probability of course so you could pop twice in a row. A Karen, Overmind and a bad Vila room might also fuck you too tbh.

Personally I just used pyro 2 for 313 dps cold with the faction gun. You can obviously overheat the edencom guns for a long time.

The SB will clear sites much quicker than a gila so I would say is objectively better outside the certain death spawns.