''Would it be better just to use AT boots with overboots? Im thinking ill be on crampons or skis nearly the whole time.''
I have seen mixed results. I have seen some folks that said their feet were too cold in their AT boots above 17k on summit day and had to turn back. Others have made it. I guess I'd ask myself if my feet run cold and if it's worth risking making the summit because of the boots.