So why did you suggest I pray to Tara.
Very simply put, taking refuge in sublime beings such as Buddhas and tenth stage bodhisattvas is meritorious because they are pure, uncontaminated and free of all afflictions. This alone eliminates traces of obscuration.
Mahayana Buddhas apparently have accomplished the 10 Bhumis the 6 Perfections etc...im sure you know the stages of accomplishments in 10 Bhumis as you are a translator.
Do you suppose that perfecting dānapāramitā, the perfection generosity means that you have removed all the poverty there is in the three realms? Of course it does not mean that. Ṥantideva addresses this qualm in the Bodhicaryāvatāra where he points out that the Bodhisattva perfected the perfection of generosity through his wish to give all virtuous things to everyone, not because he was actually able to do so. Mahāyāna is based on one's intention.
Since you are someone who has entered Mahāyāna already, it is really better if you go back to the beginning and study the teachings under a qualified teacher in a proper way. This cynicism, doubt and lack of faith is harmful to you.
Not to mention what the other Bhumis of Vajrayana and Dzogchen...their accomplishments are said to be for more advanced.
The bhumis in Vajrayāna are merely subtle refinements in omniscience, that is all, there are no special powers that Vajradhara as that a buddha on the eleventh bhumi lacks.