Not sure what kind of support AME has for ARRIRAW files. You might be better off with Resolve Lite (up to UHD) or ARRI's own ARC - ARRI Raw Converter. You want to end up with a LogC image at the correct white balance and ISO -- extracted from the metadata or can be corrected in either of those tools.
LUTs are built for specific parameters, I wouldn't expect just any LUT to work on something it wasn't built for. You could build a "more correct" LUT on ARRI's website, if you know the parameters on how it was created and what you need to output. But saying that, if this is just for viewing your composite and not baked in... eh... you might be fine.
Erik