Your accurate tracking of your numbers is fantastic; you’re undoubtedly headed in the right direction. You’re already doing fantastic at 15.5% body fat and still cycling and competing, especially at 54. Although reaching 10% will undoubtedly make you lean out more, remember that performance frequently peaks at a balance between weight and power rather than merely the lowest body fat percentage.
Using a few tools, like as a BMI or body fat calculator (MyCalSuite has several good ones), you may double-check your optimal cycling weight or body fat target. They can help you understand how your numbers relate to your age and degree of activity; occasionally, when we’re focused on performance, the “optimal” weight is higher than we anticipate.