The evidence of the video of Tip O'Neill's disclosure of the conversation he had with Powers and O'Donnell stands.
I don't doubt the conversation took place. It is your interpretation that is the issue.
If you get you panties in a wade over coercion then it is a personal problem.
No, don't go evading your own responsibilities in this discussion. The interview does not use the word 'coerce' does it?
The FBI agents applied enough psychological pressure to both Powers and O'Donnell to get them to lie under oath, this is coercion, you can tip toe and pretend it just persuasion or whatever you want.
Prove that they lied and were not simply persuaded that their initial impressions of where they thought the shots were from were
wrong. As I said, if asked 'where do you
think the shots came from?' and 'are you
certain the shots came from there?' two different answers are possible. It is not lying under oath to say 'I think the shots came from xxx'
and to say 'I cannot be certain that they definitely did come from there.' It is certainly not lying under oath to admit when questioned that it is possible that where you think you hear a sound coming from is not the actual origin of that sound. Everyday experience can show you how hard it is to localise a single sharp sound if you are surrounded by structures the sound can reverberate from.
So, what of this conversation? Well, maybe they did say they were persuaded, but it is
you and you alone that is interpreting it to mean psychological pressure and coercion were used. It is possible to persuade someone with reason and evidence, although it would seem to be near impossible in your case.