So to understand, raid power gives you more items overall, not just stuff in the rare pool? That would make sense, but then my question still stands. Do you get more items to pre-existing raids on the map, as in you already have raids, get raid power, then go into a raid and get more items, or do the more items only apply to new raids that appear after you make the sandwich, as in you already have raids, get raid power, then need to get new raids for the extra items to drop?
Also, I saw you tested in chat, could you put those tests and results in your answer and explain what they mean, if possible?