Cubase 8.5/9 and Analog Keys Syncing

Hi all,
its not really a YUGE issue but take a look at the video. I am Clocking the AK from Cubase 9
in the video, RME FireFace UFX MIDI Out to AK MIDI In. I tried with USB too and its the same.
I also do have an M-Audio MIDIMan 4x4 where my Modular and Virus TI2 are connected but did
not try with that yet. Is this normal? Can it be improved? Is it a deal breaker? Is there a device
that can make a tight Sync? … e tc…The biggest different it goes is 0.5 Up or Down, no more.

Thanks