Learn what a proper crush looks like, and set your mill accordingly. Check it every time. With heavy use, and all the vibration from the drill, the settings can change over time. Run some through, catch it in your hand, and visually inspect it.
I agree with that, but here's where the benefit of a feeler gauge comes in, which with a BC or MM is easy, not so much for GS's setup. Definitely visually inspect the crush, but IMO you can have a greater chance of consistent efficiency with a precise measurement of the gap rather than just eyeballing what comes out. I can't visually tell the difference between a crush using 0.040 and 0.037" but it can mean 5% difference in my efficiency at the end of the day.
I'm German and thus incredibly anal though,
If you can get a feeler gauge down there, I recommend it.
+ 1 on the malt conditioning too - the lautering clarity and speed is incredible