Jay, I beg to differ regarding weight. I fish a lot using a plain jig tipped with a piece of crawler or sometimes a minnow. We drift/troll at a specific speed (modern trolling motors are wonderful) ranging from 0.3 to 0.9MPH. I can attest that there is a big difference if you have a 1/32 or a 1/24 or a 1/16. Depending on wind and wave action a 1/32 may not tick the bottom and a 1/24 is needed. A bit higher speed and the 1/16 may be needed or may be too heavy. Too heavy is usually idicated by excesive snagging (we call it dredging). I have an old mold that is supposedly 1/32 and I used to catch a lot of fish when no one else was catching. Same color, same hook size and style. Other days, All I would do was tie on new jigs. In a moment of lucidity, I weighed the jigs and discovered the 1/32 were around 17 grains which is just shy of 1/24oz.
We now have separate boxes for each size as follows 1/48, 1/32, 1/24, 1/16, 3/32 and 1/8. Consistantly, we will out catch all other boats in the area. It is not unusual to see 15 - 20 boats doing exactly the same drift, same speed, but we catch more fish. Its kinda hard to be secrative but we never tell the difference and often the in between sizes are what make a limit rather than a 2 fish day.