Surely the route varies daily according to the track system? I've been across the Atlantic many times and the route is never the same. For instance, going to San Francisco I've usually gone a fair way north and then cut down over Winnipeg or Calgary but one one occasion we went right out to Vancouver and then down the west coast. Going to and from Washington late September this year we made landfall just north of New York and coming home we headed almost straight out into the Atlantic; on other trips there I've gone in over maritime Canada and down the east coast.
ETOPS may have some effect on your routing because of the need to stay within a certain flying time of a diversionary airport.