[Suicide Junkie]

In the APB vs MB arena, I just looked up the stats... MB have a very slight power advantage for range 6 only.
I originally had the impression that MB was really weak, but from the comments and a fresh look at the stats, it does seem decent.
To me, knocking off only 5 points of damage from the APB would be reasonable.

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As for PPB, perhaps an accuracy penalty to reduce the effectiveness and add a bit of flavour at the same time?

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Intel:
The economic procurement sounds like a very good, and almost trivial change.
The AIs pick randomly AFAIK, so it won't be an issue for them.

Food contamination seems OK to me... Its quite effective on small colonies, but to larger planets its only a turn's worth of population growth.

PPP and Comm Mimic are definitely overpowered, but increasing the cost will cause the AIs to get stuck on such projects when they do try 'em.

Trade disruption and crew insurrection aren't too bad.
The trade rebuilds on its own, and a ship or two rarely makes much of a difference.
perhaps 60k or 75k each would be more than enough, IMO