The recommendation in general is, don't have the points bonuses for scenario A.
Also, if you get stuck in a run of scenario A's at the start, due to the plague winning them a lot, try to convince the plague opponent to do his special mission.
I did a writeup of my campaign on my blog -
http://compel-gaming.blogspot.co.uk/2014/05/a-may-day-from-nexus-psi.html
The campaign itself seemed great but my opponent was completely fixated on the intelligence run mission to his detriment.
Please tell me how it goes!