one thing thats really helped me with my batches is letting it settle for a few days instead of over night. with a one liter batch and 8 hours settling, my first wash would turn to pure soap. after 12 hours i had to wash it gently for the first wash and it ended up taking about 6 washes to get all the glycerine out. i let it settle for 24 hours and i could shake like mad on the first wash and it seperated great in just a few minutes and only required two washes total. and thats with one liter. 25 gallons will take much, much longer to settle. when i make a large batch i put it in a black drum on the driveway and just let it sit there a few days before i even touch it. you might give that a try and see if it helps any.