No matter what you say or claim Ian, you will be left with the HARD, GLARING, UNAVOIDABLE fact that you can't provide a singe example of the amazing magical backradiation that you so fervently believe in.
You've set up your theory so that it's completely unfalsifiable. That would be one reason why it's such obvious pseudoscience.
Actual theories can be falsified. For example, if the heat flow balance of the earth suddenly reversed so that more heat went out than in, that would falsify AGW theory.
When AGW "theory" claimed that global warming would mean less snow in winter...and then when the winters became harder and snow records were broken the AGW revisionists claimed "oh no, AGW theory accounts for more snow" that is when AGW "theory" became a pseudo-science.
How do you falsify a "theory" that claims BOTH sides of any test?