I don't think that small gap is it.
I took my rear-end apart today to check everything and found what was causing the noise. It is the second coil from the bottom hitting/rubbing the inside of the aluminum control arm seat, see pictures. I think that there is something off with the manufacturing of the springs as they sit offset in the bottom isolator. My isolators were installed correctly and all bolts torqued in the loaded position.
I took my rear-end apart today to check everything and found what was causing the noise. It is the second coil from the bottom hitting/rubbing the inside of the aluminum control arm seat, see pictures. I think that there is something off with the manufacturing of the springs as they sit offset in the bottom isolator. My isolators were installed correctly and all bolts torqued in the loaded position.