Crawfish make clackin noises when they are on rocks feeding so you want it....with a football head it's big enough to create some noise for you. If it's not working then take it off. I personally don't use them enough but I need to.
Yep, with a 1 ounce football head you are making plenty of noise in rocks and rubble. Most of the time I do not use rattles. I add the rattles if I'm not getting the bites and in certain conditions. I.E. Muddy water or heavy overcast.
But even with my flipping jigs I don't use rattles most of the time or if I do I only use one. I just think it gives em something different.
Example, look at Crankbaits and how the rattles change over time as fish get accustomed to them. You see some companies changing to one large ball for the rattle or using a crank wiht lots of bb's. Look at rattle traps and the one knockers as compared to the bb's.
At the end of the day though Jig fishing is about confidence. If you have more confidence using the rattles you will catch more fish. If you have more confidence without rattles, you will catch more fish. Confidence