Here is a general description I've found helpful. First, though, be sure everything else on the turntable is set up correctly, such as VTA, tracking force, anti-skate (if applicable), and overhang. Then you can test the load. I like to use female vocals for this test, and it's helpful if there is a couple of acoustical instruments--say piano and bass. Play something with the load at the highest setting. Things will probably sound a bit lifeless and dull. Now go in the opposite direction, most likely you will get some siblance in the female voice on the "S"s. Now go somewhere in between. I try to get the most "lively" sound without any siblance. Sounds easy--not so, because it's album dependent. Who's to say the album cut is the "perfect" album. I sometimes use one or two audiophile albums that are cut at RTI, usually a good start. Then I verify my results with a dozen albums or so, including non-audiophile albums and sometimes have to tweak the results. Fortunately for you, you have settings that will make your choices a little easy and faster.
