The pictured bracket has some play in it when loosened. I completely unbolted it from the injector pump bracket, loosened the 2 bolts that hold it on to the block, rotated the bracket a bit, tightened the two bolts, and then reattached it to the injector pump bracket. Pretty much just like you said.
Another thing I did, was when I took off the injector pump bracket, I cleaned the mating surface where it attaches to the side of the block. My thinking was to make sure there were no pieces of crud that could affect how the injection pump bracket seats.
And then when it came time to bolt the injection pump to both brackets, I made sure the mating surfaces were clean, and tightened each bolt in 3-4 steps so the injection pump will straighten itself out between the 4 mounting points.
After all this, my timing belt tracked correctly. But if your injection pump's bearing has play in it, that could be a reason for the tracking problem and these steps won't do much to fix that. Good luck.