By the pictures it looks like it might be one spline off, but that could just be the angle of the picture. I would drop the shaft out and check each U joint to be sure everything moved smoothly, then be sure the shaft has the joints in phase. It doesn't take much roughness to give a vibration.
I might also be concerned with how much engagement there is on the splines, it looks like there isn't much shaft inside that yoke. Gene