How works quantity/rarity find in detail?!

i also experienced a better drop quantity after respecting from 75/378 to 125/280 (iq/ir)

Solo I am seeing no extra returns above 250IIR while running about 70IIQ. I am not sure yet if i am even seeing anything extra above 180IIR, I don't have enough data yet. My Unique drops have definitely decreased since I bumped to 250 from 180, but It would take several weeks more of testing to attribute this to IIR/IIQ and not RNG.