Nice job!
In the beginning, we were told to tighten one belt to create slack for the others like you did. I started hanging the car just a bit after doing several the original way because I noticed that we were starting to ruin the threads on the shackles by overtightening them and never had replaclacements on hand. By lifting the car slightly, I don't put the strain on that cheap all thread used for the shackles.
The way I do it now, I don't even loosen the springs or nuts.
I pull the cotter and take the wedge itself off, remove the old belt, then screw the wedge back on and reinstall the cotter pin.
Always looking for a better and more efficient ways.