Hey so on Legendary the jackal snipers can still one shot me with my infinite health and shields. It works fine otherwise but seems to just not be effective against that enemy type.
Use invisibility.
Yeah the Infinite Health option still isn't working correctly - the Jackal snipers on any level they're in can still kill you in one hit.
I've seen other trainers actually force an overshield on the player, even in the single player campaign. That would undoubtedly work. I'm not sure how you would go about doing that but that seems like the only option in regard to player health.
Can you please provide a savegame where we can get to this point instantly and see what the issue is?