Just got my new 10 gallon kettles and this is going to be my first brew. I've got what you might a call a true brew system now using pumps so I don't have to lift and pour any more. I notice that a gallon of water sits at the bottom of the kettle (because it is what's below the ball valve). How does everyone account for this water? When I pump over to the mash tun do I have to use an extra 2 gallons on top of what I need overall to account for the gallon left in the boil kettle and the gallon left in the mash tun? Should I not account for it at all and just tip the kettle and get as much out as I can? I'm assuming most people using 20 or 30 gallon kettles aren't tipping the kettle to drain every last drop. I hope this makes sense...