Interesting - I was wondering with a buddy in discord the other night, how many times are you able to shoot another raider (self defense, accidental fighting an Arc, etc) in order for them to put you in a more PVP style lobby. Sounds like that theory might be once.
I'm typically using my solo lobbies to farm trials and maxing out goop. Keep doing trials, because I just got an epic (level 3 combat augment) from a 3 star arc probe trial the other night Dam Electro storm.