I use -2 tilt and -2/-4 gain(calibration). Full sensitivity, or three to five clicks anti clockwise on the calibration knob(MAX/-2/-4 on calibration scale).
The -2 tilt is for the 40 mile range. If something paints at 40 miles, with -2 tilt, I turn.
Used to use -1 tilt. That was too close a couple of times.