As far as the table movement, make sure the two screws are tight that hold the table on, and the angle adjustment knob as well. I went and checked mine to see if there was any side movement on the blade and found none. Check the small bolts that hold the blade holders on to make sure they are tight. The only problem I had with mine was that the blade was not 90º to the table front to back. Here is that discussion... http://www.scrollsawvillage.com/topic/9648-dewalt-788-blade-problem/
Good luck, Pete