[brian51]

Pierre,

thanks for your latest CJ posting !

I have experienced similar frustrations trying to get neighbor connections to balance out  with traffic figure amounts..
However it is interesting ( but certainly odd), that the 2 outer tubes did show more balance now, even though you were trying to effect the middle tube , which as you pointed out unchanged.. I think the best try for me, was always to use the smaller connecting cross- tubes between main lines... As you have already illustrated the effects of constructing the first one of these..