i am also a hare krsna devotee, i obviously sympathize with you and i agree in full with your analisys. I have even added something in the debates you were partecipating

but my opinion is that all this promoting srila prabhupada and quoting him, especially the most energic things by his divine grace it is not so good

if you are in a context with people who are accepting srila prabhupada as guide you can cite him as conclusive proof and advice on a subject, but if you are with people who have different opinion, who do not know prabhupada or do not care.. it can lead to offences

prabhupada said that if we are discussing in an environment where vedas are not accepted we can and we must use the logic, so i feel to recommend you to keep discussing on these matters, but better to use logic and all the point accepted by the people who is in this forum.. bhagavad gita, puranas, upanishad, vedas, itihasas and so on

there's plenty of helps to sustain your right opinions without exposing srila prabhupada to useless criticisms...

hare krishna