I had it apart today, and it looks like the springs belong on the end groove. I'm fairly sure that's where they've always been because I never moved them, and they don't look like they would just slide there by accident. Anyway, my post about the tailpiece and grounding kind of evolved into this topic too. So just to conclude it here, I fixed it today. I needed to shim my neck to get the fingerboard closer to the strings on the tail end, and it was shimmed too much. That resulted in the bridge being so high that I couldn't get the trem adjusted no matter what. Today I started over, and hours later, I got the neck shimmed so that the bridge is low. Now raising the trem tail bar (I forgot which way you turn it 😡 ) lessens the spring tention, and the trem is nearly level now. It looks like all the pictures i see. 😁
Before:

After:
