rarity bugged

Many times over the last month I tried to force div drops stacking rarirty - in poe1 it worked very well - and it always turned out like high rarity (400+) on gear on semi-juiced maps returns nothing, as soon as I drop rarity to ~150-180 divs starts to drop.

Now I made a last try running with 630 rarity on gear on semi juiced maps for a while (q:100 r:100-150) and it returned nothing, as soon as I took off rarity gear and run with the normal 150-180 divs start to drop immediately.

Rarity and currency drops are bugged, would be good to make formula public at least.

Still bugged:
Characters with rarity 50% drop more good stuff, than character with 225% rarity. I can't explain this... Character with rarity 225% definitely gets better loot than character with 0 rarity, but much worse than character with 50% rarity.

Feels like trolling for the players.