We won’t know until a fix test is run out for all selected items.
As for DPK only mats.
I am pretty certain from players who are farming ( those 315 mats).
I have collated a huge pool of information before i write out that.
As for the hybird of RNG.
Silver and Gold mobs drop RNG mat. Which is 100% certain. Previously DPK mats are not included to the pool So… 
If there is 2 drop function now SIlver/Gold clover buffed mobs should drop RNG DPK mat.
I am doubt in IMC is that smart to implement those type of function anyway and most likely this is a copy paste code from KTOS. Which exist as the same function. (according to their community tester).
The only test that can prove thats its pure rng is when silver mobs in this case drop those dpk mats
basically in short the drop system are seperated into thee category.
rng purely, dpk and % scaling dpk. whichever the case we will need a even larger pool of data to confrim. we dont even know if the scaling % rng dpk works if you leave the.channel or it resets rng are always hard to test…