I just purchased a pool table and had it professionally installed. I got an accessory package with the table which included the balls, cues, etc... While playing, it appears that the table is not level because at the end of the ball roll there is sometimes movement of the ball. I have placed the level all over the table in multiple directions and places and it appears to be level, the bubble is dead center. Could this be the balls? or is it possible that the table is still not level, even though the bubble is dead center in the level. Also, the table is new, not used with 19oz fast play felt. Any ideas?