I'm new at Fallout Shelter and every time I create a new Vault, I have problem to get enough resource. So, on my last game, I'm full focused on resources rooms. For each resource I have 2 merged room, updated one time and always full. On stat I had something like 9.5 Water production / minute, and when I have updated this room again I got 7.0 Water production / minute.. WT. ?! Which game give you a worth production when you update it? I was full stock and now everyone is dead, cause I got no more caps (update cost 1125, all my save).
What do I have to do to grow up my production ??