Quote from CyeronUpdated to:
The following presented data have been collected in Diablo III v. 18.104.22.16835 - v. 22.214.171.12427.
The doubled drop chance for legendaries in 1.05 have been considered for the calculations.
Like a ninja...
this solves everything, and somehow reflect what i was expect things to be i do agree that 1/1000 looks reasonable assumption
tnx for answer )