Collector Item Drops

I am finding it rather difficult to get collector item drops in Nightfall as compared to Prophecies and Factions.I found Prophecies to be a little better than Factions but Factions is better than Nightfall by far.I can never get any drops or it takes a few days.I am needing sentient lodestones for a focus icon anyway way back in Ascalon you could get lodstoens from Hulckinglodstone Elementals to drop like meteor showers anyway this is not a rant just mere observation.How are you all finding this if you are trying to get collector items of any kind.

it varies - like all chapters

for NF,
I see many Margonite Masks, Insect Carapaces, Mandragor Roots

are you using henchmen, i find drops of anything sparse in NF with henchmen around.