I am replacing all the plumbing in my house and to the meter. I will be using PEX. I have manifolds for hot and cold with 3/4" inlets and 1/2" outlets at the valves. Do I need to use 1" PEX tubing from the meter and split to (2) 3/4 to the manifolds? I just want to eliminate pressure drops in the house as much as possible.