I went to a powerlifting gym in Japan and worked with a guy who got a silver at the IPF Worlds BP Championships a while back. It was a great experience and I learned a lot.
One of the things he told me that instantly helped my arch and upper back tightness was to concentrate on pushing my shoulders downward towards the hips. They also used PVC to loosen the back as well:
Thanks for the input everyone im learning alot from this forum, startin to see a good arch does come overnight either so each day ill try to get it a little better and shoot for a few inches better in 5 months