I'm grinding for armour on Crimon (level 26) as the AI troops kill the red ants on easy for me. I'm playing co-op with Wing Diver (to pick up the boxes) and Ranger. Ranger is at almost 4000 health. As I understood it, boxes for Ranger are 1:1 so 1 box = 1 point. But I've just grabbed at least 18 boxes, and Ranger's health has only gone up by 9. Is my understanding incorrect? Or am I now gaining less armour per box because I'm at almost 4000 health?