What's the point of having 4 LP for those if it's a 1/16 quintillion? There will be no community "Holy shit" moments. People were pissed off about uber unique rarity in d4, 4 LP is similar power increase, and this is way rarer than those items.
The big difference is that the unique effect that the unique item has is obtainable. The D4 uber uniques have mechanically unique effects locked behind the mega rare chance. The 4LP versions are just higher power versions of the same items.
It is not uncommon feedback though so we are going to have to figure out how to make it feel better.