I soloed Biddybugs when I was doing my Spharai trial, zone into Jugner (S) from Battalia Downs and they are on the north side a little way in. Easy kills, Chakra is enough to avoid resting, enough pops so that you can kill non-stop and you can use the wings that drop for the quest in Sandy (S).
Hate to bump this when I don't really need the trial or anything.. but I love the look on your face at the beginning of the new avi. Like you are detonating an explosion or something.
On topic: I don't need vermin, currently hunting NM's for GKT. Right now though it's a spider NM Ankabut in North Gusta (S). I don't know that it's the greatest place to do your Trial, but if I go out after work today I'll message you if you're interested.