[Mondial]

Why not use two 100K resistors and do both sections simultaneously? As your voltage drop decreases, your forming current is also less so it takes longer and longer. At that point you can also reduce the series resistance to maintain a reasonable forming current of 1 mA or so.

Seems like you are doing pretty well if you only have 180 uA of leakage. I would be very happy with that result and reinstall the cap.