Bablu (NTR)
Sounds nice and I can assure you that ordering it by the score can be quite easy and it also helps give a clearer perspective on your rankings to people seeing this thread but also to yourself really.
Yes I would remove the current numbering as it is quite confusing and you could start tackling the list in sections (since there are a lot of games and to avoid the task becoming tedious). For instance you could start moving the scores of 10, 9 and 8 to the top of the list in one day, then the next day you order the 7, 6 and 5, etc.
Once you have it neatly ordered, its very simple to just tuck in a new game that you've played between games of the same score!