So based on my own results, compiled with other players running eternallized(8), it is my opinion that eternallized(8) is NOT worth it.
In fact, i repeatedly find far more eternals on a dedicated crystalline(6) iiq 370 build then on an eternallized(8) 950% luck build. Anything beyond the 300% base perk seems to have no effect really. In fact, even the base 300% is not that effective it seems. I found just as many eternals without the perk.
I really think somethings broken with eternallized, but this is just my opinion based on much repetition.
It would seem with 600-700% eternallized, well... should be alot more eternals dropping, but this just isnt the case.
Anyways, moving on.