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Easy mistake. There is after all a slider system available that no one uses that actually takes away lift I think. No biggie

Stock shackle is about 4". So your shackle is a 1" lift

We have a thread on here for solving driveline vibs. That is easy to remedy and if you use any wedges in the bottom of your existing spring that will probably take care of it.

It is hard for me to tell from the pic. I need a pic of the whole spring, but it looks like an add a leaf with an extended shackle. The short blunt leaf in the tapered leaves gave it away for me. ...