Well, maybe I can help here?
One way I found to Juice w/o gaining charges (because in my--limited--experiences, charges = Heat) is to do site raids and stick to petty theft. Slow but relatively safe, even in Nightmare Mode. Since petty theft doesn't generate newspaper articles, I don't think it affects the CCS startup either if that's a concern.
Go around picking locks (NOT breaking down doors), grabbing things that aren't nailed down and aren't being watched*, optionally drop pickup lines or talk about the issues, and start leaving when the Conservatives get suspicious. Every item picked up=1 Juice for everyone in the squad, up to 200 Juice.
*If there's an encounter present, picking locks or taking things can set off the Conservative Alarm (bad), Alienate the moderate Masses (really bad), or even provoke a Liberal to cry for help (I guess xe wasn't Liberal enough?). Taking goods in particular will add a Theft charge to the taker, generally the first person in the squad. Stealth skills can help avoid raising the alarm, but not the Theft charge. Best to wait for the coast to clear.
At 200 Juice, there's no way I know of to keep a character Juicing without at least racking up Theft charges, unless you have a safehouse that can be raided repeatedly (yours or Theirs). Killing Conservatives in their safehouse (you'll know if it's a safehouse--they're clearly marked in the destination list) doesn't count for Murder charges, and killing at least the CIA or Firemen at your safehouses didn't count for Murder in the last version.
(I've read something about characters gaining Juice because someone below them Juiced enough to level up. I've never noticed that sort of thing making a significant contribution to my people, but then I don't track my hierarchy that thoroughly.)