Hmmm... Haven't noticed a "pinging serenade", but it could have happened while I was out. Loaded 8 jars two weekends ago. Came to about 3.5 Oz/jar of a ribbon/flake cut (think 1-Q style stuff, some red cake, etc). Ran jars through dishwasher on sanitize (not the lids ;-) ), let them cool a bit, load, tap the jar on the table to settle, load, tap, repeat, till about 1/4 to 1/2 inch from the top. Seal tightly shut. Store in a dark drawer in my filing cabinet.
I guess I'll see in a few months how they fared ;-)