Since rebirth will mess with the rankings, maybe you could code it so it counts rebirths also.
Like....
Before: (1 rebirth) LV 120, World Rank 2/(0 rebirths) LV 121, World Rank 1
After: (1 rebirth) LV 120, World Rank 1/(0 rebirths) LV 121, World Rank 2
See what I mean? It would count how many times you've rebirthed, and make the rankings based on that and your level.
Off topic: I am now the top poster. (Me: 180 posts CKL: 179 posts)