Hello!
The performance you get is good, especially if you consider that you have packet errors when you connect over UDP. The fact that you get much better throughput on a specific port with the same protocols hints to traffic shaping by the ISP.
The setup is safe provided that you add some measure against traffic leaks, please make sure that you enable Network Lock if you run AirVPN software. On top of that, you may also consider to bind the torrent software (if a bind option is available in your torrent program settings) to the VPN interface you mentioned.
Kind regards