Your doses of Lugols 5% are correct, 6.25mg combined iodine/iodide. 6.25 x 8 = 50.
As for vit C, its said to not take it at the same time as liquid BUT I would argue that 2000mg once a day is not enough. Vit C is such a powerful vitamin, I would take many doses throughput the day as your schedule allows and bowels can tolerate.