This is too big a question for me to reply in English here, though Zhengjue does have them in detailed Chinese on the website.
I don't mean to make more work for you, but as long as you're going to be disseminating your views in English (as you already do for the anti-Lamaism message), this is an obvious sort of thing that people are likely to ask about.
A question you did raise before on the other thread (I could not trace it), that why didn't Zhengjue discuss the matter on the table with the Dalai Lama face to face.
I'm afraid that wasn't me. In my opinion, your complaints fall into several categories, each of which suggests a different approach:
(1) Criminal complaints (such as rape). These should be heard in a criminal court, assuming there is any evidence. At the very least, we ought to know who is making the accusation, and what the accusation is.
(2) Purely religious disagreements (such as Madhyamaka vs. Cittamatra). These can be discussed most fruitfully in academic fora (such as scholarly journals) or, if the two sides basically respect one another, interfaith dialogue events. However, such questions typically boil down to matters of opinion which no amount of dialogue can resolve.
(3) Ethical violations (that are recognized to be such by Tibetan tradition), such as monk-lamas who sleep with their disciples. There is not much that can be done about this. Tibetan Buddhism is decentralized, and lacks effective judicial mechanisms to punish offenders. Many such scandals turn out to be "he said, she said" disputes, and it is unclear to what extent the entire tradition is responsible. Zhengjue has chosen to publicize such scandals, but has not done so in a careful, even-handed, or balanced way; as a result, your publications are not taken very seriously.
(4) Questions of fact (such as whether the Dalai Lama and/or other Tibetan Buddhist authorities teach that actual sex is necessary to achieve full and perfect enlightenment; and if so, whether such sex might under certain conditions be consistent with the vows of a monk or a nun). These can only be resolved if you can agree on reliable authorities. For example, you might just as a lama, but then you would have to trust that the lama is both honest and fully representative of his tradition. Scholarly books might shed light on such matters, but many of these will have been written by Tibetan Buddhist practitioners, and anyway, they may not completely agree.
My two ngultrum.