Like many before us, we will disagree completely on this point. Your assertion of further doctrinal error is baseless since you are not Catholic. That would be like me making a judgement call on the Russian Orthodox Church when I have no standing.
Here are the words from the Second Council of Lyons, 1274:
" We profess faithfully and devotedly that the Holy Ghost proceeds eternally from the Father and the Son, not as from two principles, but as from one principle; not by two spirations, but by one single spiration. This the holy Roman church, mother and mistress of all the faithful, has till now professed, preached and taught; this she firmly holds, preaches, professes and teaches; this is the unchangeable and true belief of the orthodox fathers and doctors, Latin and Greek alike.
"But because some, on account of ignorance of the said indisputable truth, have fallen into various errors, we, wishing to close the way to such errors, with the approval of the sacred council, condemn and reprove all who presume to deny that the Holy Ghost proceeds eternally from the Father and the Son, or rashly to assert that the Holy Ghost proceeds from the Father and the Son as from two principles and not as from one."
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In summary, I don't see how this will ever work it's way out unless there is a compromise on both sides. Since no one here is a trained theologian, all we can do is post what we understand. This I understand. That is why I remain Catholic.