Same problem... found this:
Russ, I started a thread on this same topic several days ago. My saw is a delta contractors model 36-650. I went through the same process as you. Initially, I thought I'd just adjust the trunions so that the weight of the motor pulled the blade assembly into alignment. This didn't work because there isn't sufficient adjustment range in that direction.
There is (for want of a better term) a yoke that holds the blade assembly. It hangs on a pin from the front trunion assembly. That's where the play is, and as far as I can see, theres no way to fix it short of taking the entire saw apart and either addressing the play in the yoke or the lack of trunion adjustment capacity in the right direction.
Or, if you don't use the saw for crosscutting, you could align the fence with the blade. Or you could sell it and buy something not made by delta. :(