>>9415066my point is that continental isostacy can affect elevation by over 1000 feet. Also known as post glacial rebound. But it's not just affected by the areas formerly under a mile of ice. Where one area is depressed by the massive weight of the ice, other areas are higher, and other areas not under ice are also lower as the continental plates hinge on their fault zones.
It's a very dynamic process. Pic related is an example of post glacial rebound where the rise of the landmass far outpaced the rising of the sea level due to the melt water.
