I spent 3 months traveling through Africa in 2014, I wrote a fair number of blog posts although most are just photos from many of those destinations:
Africa | MARK UHLMANN
I am about to head out the door but the one thing I will say is there is simply no replacement for time. In my opinion, anything less than a month is not worth the expense and difficulty of flying to East Africa. Short of the uber $$$ private plane everywhere approach, the only way to get between these destinations is to drive. The destinations are long ways from each other and the roads are terrible - there are many days where we did 8-10 hours at an average of 50km/h or less because the roads were dirt, gravel, or simply so riddled with potholes that you couldn't go faster or risk damaging your vehicle.
More to come.
Mark