Doryani Prototype + Black Cat charm + Burrower Ring

Both the black cat charm and burrower ring make incoming lightning dmaage unlucky. Do these 2 items stack on top of one another?

I doubt it stack. It cant even stack. Unlucky means "do 2 damage rolls and pick worse result". So it doesnt matter how many times you do the check, the result will be same.

Its like having two numbers, 2 and 10 and checking which is lower. You check once and its 2. Check again and its still 2.