I did a little testing with first aid kits (LootFirstAidKit, the most commonly used one). It has 2 entries for the LootChemsHealing75 list. That leveled list has the global ArwenMult30, so for every item on the list there's supposed to be a 30% chance of getting it. There's one bandage on the LootChemsHealing75 list.
I've placed 24 LootFirstAidKit boxes in a room, and checked their contents 10 times (restarting the whole game for every test, while starting in a different cell). The only mods I'm using are the official DLCs and all ART modules.
Here is the total number of bandages I found during each check of the 24 first aid kits:
3, 2, 2, 2, 2, 2, 1, 5, 2, 2
Something appears to be wrong here. If the chance of finding a bandage in a first aid kit is truly 30%, I should be finding 7 bandages on average here. Because the LootChemsHealing75 list is in the first aid kit box twice I should actually be finding 14 on average. My luck was 4, I don't know if that influences anything.
With so little bandages to be found in first aid kits, and vendors also barely selling any I'm running into trouble. I know they're supposed to be somewhat rare, but surely not this rare. I'm finding more blood packs than bandages, which is a little odd I think.