Fanuc irVision part identifying

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We have a 2 R30ib controllers with 2d vision cameras for each mounted above a conveyor. It looks at 8 different part type and gives offset information to the robot for the pick location for the tool. There is one conveyor and 2 robots, one on opposite sides. Since the last upgrade for new model parts, only on 1 robot /camera set, there was one set of parts that the locator tool would mis identify the part as one of two other types because the inspection areas were too similar. This past weekend i removed the emphasis areas and then masked the areas with similarities. When i did the snap/find on the stationary conveyor i got really good scores in the 90's. But once conveyor was moving the locator tool was unable to locate the part? I'm new to this system and learning on the fly , has anyone suggestions on what might be the issue?