Jonno said:

Which tools are you using, PDB? Do you have something with an automated matching function, or are you doing it more by eye/histogram?

I settled on using Adobe Premiere, Speedgrade and Davinci Resolve Lite. I use Adobe Premiere to break down the entire movie into individual shots. Even a movie from the 70s has thousands of shots and its super time consuming. From there I was using speedgrade but I found Davinci Resolve Lite 10 (haven't tried 11 yet) which is free and only has a few limitation over the full version (no 4k). Resolve has curves which speed grade lacks. Its great software if you can run it.

I'm actually grading the entire thing shot by shot and then going back over to fine tune. End of story there is no automatic software that works 100%, at some point you have to do some manual work.