Modern technology has revealed how the Labrador Current flows. It basically follows the slope of the edge of the Newfoundland Grand Banks. Running south then betwen The Banks and,round the underwater mountain of Flemish Cap before turning south southwest then westward back toward the Gulf of St, Lawrence. Historic data shows that it has always done so. It is cold water so much more dense and tends to sink below warmer water.
Icebergs and pack ice are effected by both currents and winds. The prevailing wind on the western side of the Atlanic near the coasts of Nova Scotia and to the south west of Newfoundland are from the west or northwest. Hence, if there is a great deal of ice surviving the journey from Labrador and points north, it will find its way into the path of the prevailing winds. My guess is that the ice that did for Titanic and all the pack ice with it, got there by a combination of strong winds and a previously cold winter in lower latitudes.
There is ample evidence to show that there was not a current in the vicinity of the Titanic wreck site but that the northern edge of the Gulf Stream was about 10 to 15 miles to the south of it.
Jim C.