I’d be more concerned about the rest of the lease than I would the bonus. 20 acres is not small. 3/16 pays 50% more royalty income than 1/8. Does a $1000 make that much of a difference in your standard of living to possibly reduce the income by that much for decades?
Something to think about.
Regardless, my common response is “The Bonus and Royalty Interest MAY not be the most important thing you negotiate on your lease”. “IS” may be a better word to use than “MAY”! 