2. The vigil at your Antiochian church begins at midnight which is the prescribed time for the vigil and the Liturgy.
I would be interested in knowing your source for this.
In Nassar's Divine Prayers and Services
on p. 400 I read: "...if the Feast falls on a Sunday or a Monday, the Hours are chanted on Friday morning, and Great Vespers on Sunday evening. The Mass of Basil the Great being said on the day of the Feast".
In The Festal Menaion
by Mother Mary and Archimandrite Kallistos Ware (sic), there is this note on page 252: "If Christmas falls on Sunday, the Royal Hours with the Typika are said on Friday, 23 December. On Friday evening and Saturday morning, the office of the Forefeast, 24 December, with the Liturgy of St. John Chrysostom. On Saturday evening the Vigil begins with Great Vespers, followed by Mattins: Great Compline is not used. On Sunday, 25 December, the Liturgy of St. Basil." (that rule is in the group of rules in the Greek practice)