2. If you have several people, try farming hideout (WorldMap, on left-top between lawyer and vtec bases), polymer lab 2nd floor (right top building) and robco 2nd floor (main building) (armory will b hard, expect to fail couple times and lose gear, try with 5+ people). Those have stable nice loot drop and low risks.
Another way is to have "pvp" in contested zone. Create chars in 2 different factions and shoot each over / heal / resurrect with auto-defibs (cheap and useless in real pvp) if killed. Low number may decrease reward (dunno for sure). I expect it might scale somehow similar to capture time, so in best case you might need 6v6.
3. Don't get used to one char and one weapon. Use "~give me the chocolate" and "~reroll S P E C I A L" to adjust your build for situation and playstyle often, it's free.
4. Lately lawyers and vtec were only active. BBoys were the most inactive. If you want some teamswitcher to support you from time to time to have more stable pvp, go Family. Some lawyers might switch Lawyer-Family alts to provide better balance.
Lawyers/V-tec had from ~3 to 12 people in swarming times.
If you have less then 6 and don't mind let someone else to help (or spy), I'd say go Family.
1. I will take a look if it's a quest script bug today, Cirn0 might have answer faster. Best to post bug report.