Howdy!
I'm NC43. In the winter I use Stila Sun Bronzer in shade #2 (could go a shade up if you want more defined contouring) and last summer I used MAC Matte bronze, this summer I plan to do the same as well as use Benefit Hoola.
Out of all of these Hoola is probably the deepest but you might want to keep building it up if you want to sharply define.
On YT I've seen some makeup folks use a foundation stick (Mac makes one, Bobbi brown does too) in many shades darker than their skintone to contour. That seems to work really well to get a lot of definition.