I don't know what videos you're watching, but they don't sound like a good resource. If you only ever shoot from the bench, optimize the eye relief for that single position. My interests result in more positional shooting, so that typically results in setting the ocular relatively close in the prone position so that the optic is useable prone, sitting, kneeling, and standing. Regardless, use max magnification to set proper eye relief as the optic will be the most sensitive at max mag. Once you are comfortable with the eye relief, I typically set the rings as far apart as possible. Then make sure your diopter is set to your eye, optic is plumb with gravity, and torque everything into place.