My farm team has been rushing AO2.4, in search of a shock lance, and last night we ran it about 30 times. Every run the boss dropped an average of 1-2 pinks, but every 3-4 runs he would not drop a pink.

This morning I have run the same dungeon another 20-30 times, and ZERO pinks dropped from the boss. Does anyone have an explanation for this?

On a related note, I have run Plasma Pyramid about 50 times, full clear. The bosses dropped a typical amount of pinks, but I have yet to see any trash mobs drop a pink. Is this intended due to the number of bosses in PP?