I'm not even sure it is possible for me to complete a trio. I'm probably close to the rate at 1300 kills. It's been a while since release.
They should just ninja strike it into submission. Make it a skilling boss with portals and practice mode which allows the selection of trios. Give WAR a trios chance booster. No reason to swipe our hunter marks.
I can't even describe how angry I was the last time I failed a trio. The most difficult part by far is getting the center bait station built. So that should be the priority. I set myself up for failure by building everything else first. It took forever and then I fail immediately in the middle.