I am not ignoring them, i am in fact using them to TRY get even better predictions.
I am very sure they do not simply increase overall legendeary droprate but i am still not sure what exactly they are doing. As far as i know, the formulas are secret, so we have no idea what they exactly do.
For example we both had one rare item drop very often fighting the warrior. First i was thinking they enhanced the specific item i got 5 times, now i am thinking what could cause the behavior including your experiences.
We do not even know if the formula is influenced by other things like number of players (i think so) and maybe even classes and items used.
But one thing for me seems to be sure: the system does not behave as if it just would be an increase of the overall droprate. I concentrate my tactics on this and you can concentrate your tactics on an overall increase of droprates.
in the end we have much to few data to do more than guessing.