If one is so worried about their log converting to Rec. 709 in a mathematically correct manner, then is there really any advantage to shooting in log over rec. 709? I thought the main purpose of log was to facilitate manual adjustment rather than trusting your software and knowledge to be better than the camera’s. I am not really making statements of fact; I am still learning about log too. Maybe it depends on which color gamut the log format uses.
See the other new thread where I mention numerical pixel format issues with respect to Shotcut’s internals. Given that, you need to be mindful when any filter is likely to introduce clipping and move those to the end of the pipeline. Position the filters that need the elbow room of log earlier.