I'm new to foosball and just got a Warrior table. Maybe I'm being anal, but I can't get it perfectly level as determined by placing a two foot level at various places on the field. Its not off by much, but i think i can tell when, for example, practicing tic tacs. When leveling i get to a point where improving one side of the table worsens the other side. Is this normal, and just a "characreristic" of the table?