I had a bunch of walnut milled about 6 years ago and had a 8/4 slab cut out of the middle of the tree so it's like 20" wide and 12' long. I had it stickered and it dried pretty flat, but then I pulle it off the stack to get to some wood beneath it. Well I forgot to put it back on the pile and it got rained on a couple times and it cupped about 1.5" across the width. I put it back on the pile and put a bunch of weight on top, but it hasn't moved much. Would it do anything to get it wet again?