Dullahan is already on a 2h spawn which is the lowest of field bosses.
The actual qualm is that there isn’t more field bosses to split the player base up since you can’t be in two places at the same time (unless you’re a Sadhu
)
You have Dullahan and Kubas. Kubas doesn’t get as much play simply because half the playerbase can’t tell the difference between Crystal mines 3f and Crystal mines lot 2. If there were 2 field bosses on a 2h cycle you’d split those dullahan numbers by a ton.
Basically lack of content is a problem (as well as general optimization) since it funnels players into the same spots and the game obviously doesn’t handle that well.