Is the crank new or used? New bearings I suppose? Just curious. And if everything is ok and you are checking it correctly, you can remove the bearing and sand it on a flat surface with 1500 grit sand paper with oil.
Hold on a minute! unbolt the thrust bearing cap, rock the crank back and forth, then bolt the cap on and incrementally torque it down, while you're doing that rock the crank back and forth as you tighten it. This will align the thrust bearing, you may have more play than you think.