i dont think there is a way to get 100% chance.. since the game mechanics only allow u to reach a max of 50% ... but maybe it is possible to edit packets ... or something like that to be able to link a lapis with the linking % of another lapis... such as to link a lvl 6 with the % of a lvl 1 lapis
... which is what i was looking for ... but actually i'm not an expert of packet sending, so i'll need some help to work with this.