I've had similar issues with using ACES. Resolve doesn't seem to apply the correct LUTs in many cases. I usually work in standalone and I had just tested the Resolve Fusion workflow so I simply switched my project over to Fusion Studio. Not sure if that is an option for you. You should have access to Fusion with your resolve license, too.
I personally have tried using Resolve Fusion several times but it's just very unclear when and how it converts footage while ingesting it into Fusion. Especially if a project requires different sources in varying colorspaces. All that is very clear and manageable in Fusion Studio.