From your story still the only things I can think of are:
1. There still is some oil in your airbox from previous overfilling. After 50 kms the oil is warmer and can more easily drip through the little pipes. Dismantle airbox and clean.
2. Overfilling with oil; are you you check the level correctly? As follows: at least 15 minutes of driving. Stop the bike but not the engine. Idle running for at least 30 secons. Stop engine and check. This is the correct oil level!
If all this does not help try and live with the oil leakage: your engine oil level is ok so no worries there. Since you are talking mzungo's you're in Africa so worrying about keeping your bike in the good old etat de concours is too much of a challenge anyway ...
Stay upright!
Auke
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