Motor cogs with no load, especially at high rpm

Dear Forum members

I've just bought my first vesc, connected it to my battery and hooked it up to my pc. I ran through the motor wizard etc. The problem is, that the motor does not spin up properly. During the motor setup wizard the motor sounds normal, but when i try to control it with the remote or with the keyboard control it sounds really weird. It runs okish until lets say 50% throttle, but past that it begins to slow down and even cog/stall. The motor is running freely and has no load whatsoever. I've linked you a video and pictures of my settings to see and hear for yourselfs. (I ramped the motor up with the remote, not with the keyboard in the videos, because ramping it up with the keyboard didnt work at all) Does anyone see what the problem could be? The vesc is from maytech (50a) and was updated to the latest firmware available.

https://drive.google.com/folderview?id=1jQYyGOYT7z2VTuFclsQZ5n4yTA7VfUNA

Cheers,

Juri