Is it possible to simple revise the Photoshop graphics? It might be possible to make a new preset in Photoshop using the HDTV (Rec.709) color profile and then copy/paste the original files into the new template and put those newly created files back into your video. I’m not sure if it would work, but it’s a fast and easy test.
I’ve also herd suggested that using an adjustment layer over your entire spot and adding the Video limiting filter AND a color correcting filter–but making NO adjustments to the CC filter will clamp not only the Lum part of the video but also the Chroma as well.
I don’t edit with Premiere so I can’t test it, but give it a try and see what happens.
Not my monkeys. Not my circus.