GAW: I don’t have one but it’s very Mistaber. It’s no less than a Minhag Tovah that you’ve done 3 times in a row or Devarim Hamutarim Sheacheirim Nahagu Bahem Issur.
OK. When you find a source, get back to me. Meantime, SA & MB say you are Yotze (not that it is “Mehadrin min HaMihadrin” or anything 🙂