[Alex Fuchs]

Hi Jamie,
try to import the DNG’s over Davinci Resolve (lite version free to download, but restricted to max. 1920×1080 footage). Load them in Resolve and export them as proxies in a format you prefer. Then import the proxies in Premiere Pro, do your edit and at the end export your edit as XML and go back to DaVinci Resolve. Do your Grading there and export it in the Final master format. Should work.
Cheers,
Alex

Alex Fuchs
DoP/Editor/Motion Effects
Visual BastARTS
http://www.visual-bastarts.com