Maybe a compromise would be a sliding scale

So your level - 3 girls are 100% more likely to drop

Your level - 6 200%

When we get there - 9 is 300% and so on

Something about your ego overwhelming them - it makes back farming a little more attractive, I mean right now I could be farming world 1 at + 200% (but it has no boss so moot point) 2 - 4 at 100%, or carry on trying my luck with Dom looking for a cat girl