I agree this will be tight - also if you get there right before start, you will sit up top - don't know if you care about getting a closer seat. I would keep trying to modify your FP for after(1:30-2:00 start time) or you could see later IJ show - they usually go till 5 or 6, unless this interferes with other plans. If not, you can check in for FP 5 min early, so 12:35, to give you a little more time. HS is a challenging park to fit in rides and shows, plus a meal in one day!