Africa, PE, Agriculture background looks interesting to adcom.
Strong GMAT nos but low GPA would be your biggest weakness.
You can't do much to overcome the low GPA so don't sweat it too much.
Focus on a tight story that shows a brand of leadership through your commitments in college and beyond.
Then make it clear what your vision is for how you intend to impact/shape Africa post-MBA.
This can make or break your application if you can show great track record already that leads you to want to do more/bigger with the MBA.
You'll need to be a bit more specific and not simply list firms you wish to work for but what you wish to achieve through PE and HOW you intend to do so.
The Ph.D. stint could raise questions of focus - so be ready to explain your thinking, departure.
Happy to speak with you further about your profile.
Cheers,
Chioma Isiadinso and EXPARTUS Team
PS - Check out our blog for scholarship info for African MBA applicants