The reason for this space discrepancy is that the exFAT support was implemented in our RAM Disk before Microsoft published exFAT specs. So the implementation was mainly based on educated guesswork and experience, and to be on the safe side we allocated more space for file system structures.
Now that MS has published the specs, we reviewed the code and implemented a more compact FAT table. In our tests, there is now a bit more space available when formatted from RAM Disk comparing to Windows format, as shown in the screen shots below.
Please
download the new build and let us know how it works for you.