Goemon_ said:I just thought about one more thing : If you open the cooker too early the jars haven't cool down enough to be sealed but they will sealed as they cool down. As have been said before I don't see any reason for the jar not to seal correctly just because they are too much filed.
Yes, allowing the cooker pressure gauge to come down to zero is very important (it should be noted in your booklet from the mfg to always do so) for your own safety as well as the jars. You shouldn't try to move them from the cooker either until they have stopped internally boiling - which could take some time.
FWIW, I've not experienced jars not sealing properly that were filled up to one inch from top (while cooking largely fat) though it is recommended to not fill over 1 1/2 inches from top, and I've canned quite a bit of food consisting largely of fat. There was some slight leakage (based on the water in the cooker after opening), but that didn't refrain from sealing properly. Not sure, other than following all the proper directions (using vinegar on rims of jars, etc.) what advice to provide, seek10.