Theres no good or bad in the % itself.
The % merely represents the chances that it will assimilates other stats of your item.
When Assimilate happens it will reset a stat of your item. Either to better/worse.
So now, how do we know when to use what %?
1) You use 30% stones for weapons with crappy stats.
Assimilation can give u better stats, so cross your finger.
2)And use only stones with low % on weapons with good blues and stats.
You don't want it to assimilate your good stat don't you?
