Right. If you were getting 2.5 of the black stuff before getting to the bio, you should be getting at least what you put in(4.4 gallons) and then some do to soap formation. You should be left with 18 or 19 gallons of unwashed bio. If you end up with more "bio" than oil you started with, that extra would disappear as soon as you washed it because its just unused methanol. You still haven't said what pump your using but 7 gram KOH plus a titration of 3 would be 10 grams per liter. 10 grams times 75.7 liters(20 gallons) is 757 grams or 1.67 pounds dissolved in 4.4 gallons of Methanol. If you are using a poly reactor I would bump up the temp to 130 degrees and leave the pump on for 1.5 to 2 hours. Let settle for 2 hours after pump shut-off and drain glycerine and then come back the next morning and drain the last little bit. See if that helps. Also make sure your oil doesn't have a ton of water in it.