[QUESTION] Upgrade

Hi, again me yes :D
But, i wanna ask, is there possible somewhere increase chance to uprgrade item?
IDK Like:
0-11 No fail
11-17 70% chance
17-20 30-50% chance
19-22 20% chance
21-24 10% chance

is it possible? :)

Thanks for reply

TGAME -> TITEMGRADECHART

Thanks! :)