Join Date: Mar 2010
Location: Central Washington State
At this point the repair is pretty simple. You did not explain how you dressed the edges before joining, or I missed it. If the edges were not perfectly square with the faces that could be the cause of the warping. And, yes, alternating the clamps and applying even pressure is very important also.
I would simply saw down the middle of all the glue joints and then dress the edges with a jointer to make sure they are nice and square, and then re-glue everything. I would think that would only take about 1/2 an hour.