When you measure the blades for level first be sure tires are properly inflated.Next turn the blade so they are side to side.That should be level on both blades (3" for example) Then turn so they face front to back.The front facing blade should be 1/8 to 1/4 lower.
As of right now, everything is tight, blades are within a 1/16 of each under in the center of the deck and side to side the deck is level. Also the front of the deck is about 1/4 lower than the rear.
Update: just finished the yard and the cut is better than it's ever been. I rechecked the spindle bolts and they are still tight. Should I lock-tite them?