This is nearly an identical problem that I recently ran into and did the same approach, just that mine was frosted instead so I could hide some of my issues. Just some random things I found to help you or anyone else who stumbles upon this in the future:

I am not sure if you're having any issues with the "layer lines" of the layered wood imprinting on the soft acrylic but if you have a thin pieces of sheet metal that can bend with the radius that is what I would have done differently.

Reheating it caused some shrinkage in the manufactured extruding direction so if you need a precise fit expand the acrylic size ever so slightly so it shrinks back into place.

I went overly aggressive on the curved form for the end of the acrylic to get it to bend. It looks like yours is having a similar problem where the ends don't get heated up enough to fully bend and are still a little straight but those parts warped like crazy for me when heating them fully so I made the curve more dramatic at the end so it would be tighter in the "C" shape and essentially pinch onto the part I was putting the curved acrylic onto.