As you have observed, there are several ways of calculating IBU and they don't agree. Tinseth & Rager are the most common methods and they don't agree.
I leave Recipator set on Tinseth, because I really don't think one is any better than the other. Unless you are planning on having your ale tested by a laboratory, you won't know what you have anyway. My hopwine came out at 281.8 IBU, not likely, but fun to mention.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk