Okay, so I built my new manifold in my 48qrt cooler using 1/2" copper pipe. I put 3 gallons of water in and only got 2 gallons out. When grains are added does this help to push the wort into the pipes more as opposed to me just putting 3 gallons of watter in and draining to see how much is left? The pipes are flat on the bottom of the cooler, so that is not an issue and the holes drilled are facing downwards as well.....