Don't feel bad. A week or so ago, even after using them now for 3 years, I had a brain fart and tied one on upside down. I went to lift a small fish up, and a 3 oz jighead fell right off the clip. The fish swam away trailing the jighead and the 9" Sluggo attached to it
I've never had a problem with the 80# clip. I run about 12-15 pounds of drag on a Saltiga 6000 for Canal fishing. 50# Big Game or Cortland braid. Not one snap failure with the 80# clip.
IMO, the 60# clip might be rated accurately for 60# break strength, but the 80s are way underrated. They have to be at least as strong as a size 34 Coastlock.
Threaded Mode