“We are instructed to rightly divide the Word. It takes a lifetime of study to make good progress in rightly dividing the Word.”
Sounds like a whole lot of words to say “No, I don’t have any objective principle of interpretation, I just apply the rule when I feel like it”.
If that is not the case, then you would be able to state a consistent interpretive principle plainly. If you can’t do that, then I assume it doesn’t exist.
I think you've done that all your life, make false assumptions.