You don't say HOW big of a fence charger.
You don't say where you live-dry desert? frozen tundra?

Other than that, you seem to me to be on target. If you suspect any grounding issues, add more ground rods.

Rods, wire and ground clamps are spot on for quality. Only reason to go to galvanized over copper coated is cost savings. For what you're doing, quality is first concern.