For off-road riding, esp., I don't think you'll find anything stronger, that provides more protection to the handlebars, cables, grips and electronics, (and bike, overall) than the Hepco & Becker handlebar guards.
Protects the handlebars and everything in between, from ends of the grips to the tree, with heavy duty steel tubing.
And it fits over the OEM shields like it came stock from Honda.
And personally, I notice a better sense of control, esp. while slow-riding or on the dirt or on the winding backroads--that little bit of extra weight on the bars seems to counter-balance the inherent top-heaviness with a full tank, gives the bars/ handling a bit more solid feel.
Hepco & Becker makes some exceptional stuff for the Africa Twin.
2018 Honda Africa Twin Adventure Sports - Manual.
Setup: Givi Tall Sport Touring Windscreen; Hepco & Becker Lower Engine Guards; Hepco & Becker Handle Bar/ Hand Guard Protectors; Hepco & Becker Tank Guard Soft Bags for OEM Uppers; HTTMT Kickstand Pad Extender (Red);
RAM Mounts X-Grip; Swegotech Forkshield; Touratech Zega Mundo Panniers and 2018 Rack (31/38L); Touratech 20mm Bridged Handlebar Riser; OEM center stand; OEM skid-plate, uppers and tires.