There really is no way for myself or another other personal trainer or even a
dietitian to know this exactly.
Your optimal macronutrient profile (%carb, %fat, %pro) is usually
determined by having you fill out special surveys to understand your nutritional
behavior and how your body responds to certain food intakes.
Even after you find this out, you may find that the breakdown of nutrients
doesn't help you very much and trial and error is necessary to figure out how
your body responds to a new diet.
Since your body fat % is currently very good you may want to simply reduce
your fat intake.
Fat has 9 calories per gram where carb and protein only have 4. If you
lower your fat intake you will likely lower your overall caloric intake to the
levels which will allow you to gain that extra definition you are looking for.
If you severely lower your fat intake, you could benefit from taking omega 3
fatty acid supplements (fish & flax oil) to make sure you're not deficient in