Dent removal advice

[turbodig]

So, I still have the bed off #689, with the on-going frame re-do and general undercarriage clean-up.

Anyway, the front of the bed had a few dents in it from stuff smacking the front on hard braking.
(Most notably, 2 16# bowling balls).

While I was able to hammer and dolly the small dimples out pretty well, I still have an overall "bow" along the front of the bed. It seems to peak where the rib between the "panels" runs on the driver's side.

Any trick to getting this flattened out? The bowed area is about 1/2 the width of the bed, just from an eye-ball estimate. It's a pretty slight bend, you'd likely not notice it on the truck, but you do notice it while the bed is off. My OCD won't allow me to put it back on the truck with the bend in it...

Thanks,