I am not sure I understand your distinction between "inherited sin" vs. "inherited will to sin" If we are in Adam, we inherit his sin, just as we are in the Second Adam, we inherit His Justice. Or are you saying that we only inherit Christ's will to be follow Him?
What is the filioque of St. Augustine?
regards
You should read them because they are part of what led to the schism. Augustine was the author of the filioque which is what was added to the Roman creed.
The Orthodox reject the view of the original sin by Augustine also, and thus have no need to patch around the Virgin Mary to sew together a hole in the doctrine.
The answers to both your questions, whether you like the answers or not, are in the documents I've posted and linked to. If you are interested to know what doctrine issues separate the churches and which actions of the churches separate one another and thus gain perspective on the nature of discussions between Metropolitan Kirill and Cardinal Kasper you must understand the different position of the Orthodox church on these issues, instead you're throwing out straw men, and proclaiming the pope is always right.
This is another grave reason the is not unity; because of the Catholic notion of Ex Cathedra the Catholic church refuses to admit it could be wrong on any of the doctrines which are disputed.
That mentality (heretical to boot) makes meetings little more than an oppurtunity to say "We're right, you're wrong, but we'd really like it if you admitted we're right".