Got it - with CSSN you don't really need the avoid trips> zero. The only reason that I have used Avoid Credit > Zero in the past is once I am in the LCW I Don't want another crap trip thrown in. Probably not as much a factor on the WB - just a holdover from my NB days. As far as I know requesting min credit can be Administratively denied but avoid credit >zero will be honored unless you are in the coverage zone.
Scoop