Warped Tabletop Help

Is there any hope in fixing this farmhouse tabletop? It is 3 - DIY store 2x12's joined with wood glue. I used six alternating pipe clamps during glue-up. Used electric planer and orbital sander, table top was nice and flat before finishing. After staining the top and applying several coats of polyurethane, the top started to arch and progressively got worse over the course of a few days. It actually looks more severe in person than in the photo - maybe 3/4" difference from edge to middle.

I spent hours going through lumber to find the best, straightest pieces I could find. So, the boards weren't warped when I started. I think a major factor might be environmental, I live in a hot and humid climate. Today, took it inside to my air conditioned house in hopes of some improvement.

Thoughts? Help? Advice? Thank you in advance.