Sorry for the delay. Metal roofs are always hard to render well when they consist of repeating patterns and have reflections (even if they are minor).
Sometimes too much overlap is a bad thing. If you have one set of images from just half of the double grid that don't appear to have big differences in the reflective surface that might turn out better. Also, try running it as 2D.
Tipping the gimbal up makes reflection differences worse...
You can do color correction before hand as long as you don't move any pixels around or modify the location tag data.