I hand mill my grains, gap set at about 1.1 mm , or .045 inch? Hand milling crushes the grains, rather than shattering them, leading to good runoff. I found my efficiency dropped when I tried to use a drill on my mill.
I use a taller, rather than broad cooler for my mash tun.
It's fitted with a manifold I made according to the specs in How to Brew by John Palmer. I have virtually no dead space in the mashtun cooler.
I batch sparge, but do a mash out addition before my first run off.
I run off slowly, and sparge slowly. Runoff and sparge takes about 1 hour all up.