I have done a lot of canning, but these pears are getting the better of me. I am canning with the hot pack method and using water bath in one litre jars. The juice is leaking out into the water bath and by the end of the processing time, the level is too low. So with my second batch, I put fewer pears in each jar and it was better but still had one jar with low liquid level. I am using a simple sugar syrup and a scraped vanilla bean in each jar. What am i doing wrong?