Hi i have boiled roughly 800 gallons and only have finished 8.5 gallons of syrup. This seems to be way off from the 86/ sugar content rule. My syrup has averaged 2.58% sugar. I am using a calibrated refratometer and have cheked it to RO to make sure it reads zero on RO. Am I missing something or why would my sap to syrup ratio be this low. I have been finishing to 86 brixs