I need some help. No matter what I do, when I try to slice brisket, it crumbles into pieces. Sharp knife. Meat slicer. Cold . Hot. Thin slices. Thick slices. Oven cooked. Smoked. It doesn’t matter. I watch video of cooks and they get perfect slices. My brisket always tastes great and is very tender, but my guests eat shreds and crumbles. Any tips?