I have an about 14 chains, trying to get a trophy.

I have atleast one Wraith when exploring at night, sometimes 2-3 during night.

The only one of those that isn't a night spawn is the abomination. So, basically bad luck and a high traffic area. Or would have been good luck if you could manage to get all those chains. Wraith hunting seems to average about two a night.

ok?

Sounds about par the course for the swamp lol. I always clear an area during the day, preferably around 2 or more structures because I believe they spawn near or in structures. Then when night time comes you are only dealing with the wraith and maybe minor respawns.