One thing I forgot to ask about... your OP states you are on gravel. Are you using something else like pieces of planking under each jack foot to help create a larger foot pad on the gravel? I learned this trick from others that's to minimize more of the side to side movement caused by jack stands, the pad needs to be as large as it can to create more friction than what you'll get with the smaller feet of a jack stand.
I use Lynx levelers. MY BIL uses homemade 18" planks of wood, but I think something more is needed than what is provided with the smaller feet. I use them even on solid ground, too. It's just part of my set up process.
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