We also ended up using pgloader. Its not without its friction either. For example the concurrency/number of rows setting seems broken out the gate, and its like

We also ended up using pgloader. Its not without its friction either. For example the concurrency/number of rows setting seems broken out the gate, and its like playing darts with a blindfold on to get it to run without running out of memory. But being able to read the source, github actions, and overall at least I could debug my problems, or find others who had the same issue. Would recommend pgloader.