Wondering how to efficiently lauter my mash

[brewrick]

Having an issue with all grain mash. I am trying to not leave the mash on the grain and have been using sparging bags to remove the spent grain but too much water remains in the porridge means adding more water and messing up my sg. Wondering how you might be dealing with it. I heat my water, add to insulated mash tuns; add grains and rest a couple of hours. 5 gallons becomes 3.... have ordered a couple of lautering screens/false bottoms but those are for next week.