The chain is clean and well lubed, and runs smoothly over all links.
We were climbing steep monsters yesterday and I was shifting as needed to keep up with the group. Certainly I shifted under load and chain suck was exhibited during those shifts only. I will not be filing my rings. I will continue to climb steep monsters. I get the part about easing the load until it reaches 3:00. I'd have to practice that next time I'm climbing the wall. Perhaps some anticipatory shifting is in order....

Thanks for your input!