Another table saw question... alignment

Ok I’m sure this has been answered somewhere but I have been unable to locate anything that helps, so here goes.

The saw, Craftsman 24140, 9” about 36 years old. When I check the blade against the miter slot on the fence side the back edge of the blade is out of square about width of a doubled up dollar bill. So far so good according to some things I have read here. By the way I should mention that I just received and installed a brand new Freud combo blade. OK, so I run a piece thru crosscut and the cut is exquisite but not square, so i set the fence and rip the piece and got a beautiful flat/straight side. so I square up my miter gauge using my Starret, put the freshly ripped edge against the miter and cut. when the piece contacts the teeth at the back of the blade there is just a little ‘shaving’ of the piece. The vertical edge shows perfectly square (or perfectly enough for me) but the horizontal edge is out of square enough to be plainly visible to the eye with the Starret on it. I am not shooting for .001 tolerances I just cant figure out whats going on with not getting a square horizontal cut.

I hope that makes sense and someone can tell me what I’m doing wrong or need to do to correct it.

Thanks, TD

-- Who looks outside, dreams; who looks inside, awakens. -Jung