Wow, thanks for all the insight Mason. I apologize for my tardy reply as I've been off the grid for a few weeks.
I will talk to my camera guy about switching to EI as soon as possible and meanwhile, Andy, I guess I will treat the footage as I would REC 709 and do my initial adjustment in Film Grade as I find that to be the best starting point. Unless you had a wiser idea.
Once again, thanks for all the help and I will also be sure to check out Alister Chapman's page.
Best, Darren