A new Argon firmware has been released today. Version 1.1.0 adds few new functions and among other adjustments, it includes the performance increase discussed in the earlier post.
Granity servo tuning software
Full change logs and download can be found from the Wiki (Firmware, Granity).
Update: Turned out there was a clitch in one of the new features. FW version 1.1.1 has been released to address that.