The oculus window has to stay in the background as far as I know.
If you remove the "-othervr" it should use the steamvr. I don't think the start tag "-steamvr" is recognized, it may just ignore that and work as if you had no tag at all.
Give us some time to try and reproduce this issue.
From what I understand it is working for you now when you leave the oculus window open or when you start with steam vr?
I tried steamvr since I thought that if -othervr exist, -vr or -steamvr should exist too
-steamvr is recognized, since without, aerofly standalone version start without any VR engaged.
-othervr is for oculus, so it's probably why it starts oculus first and switch after to steamvr since occulus is not connected
Thanks for your help