You're doing better than me then, probably due to the Vive having a lower resolution than my two most recent HMDs: Odyssey+ and now Pimax 5K+.
For me it all depends on the conditions. I can usually see fighters up to about 3-4nm, then they sometimes just disappear. I've taken off in MP in short trail of a friendly fighter and by the time I get wheels and flaps up, set my radar how I want it, get my CM turned On and into Man1 profile, and look back up...if they stayed in burner after taking off, while I didn't...they have totally vanished. Pretty terrible.