Oi, you told me about illegal formations (first repliee). It may be you have an illegal formation; have at least one in each flank, one in each row (ST,AMC,MC etc.) or try other formations.
Not following one of these rules will have the 20% possession because it will penalize (good word) you for it.
I posted about this jest yesterday, and it worked for me.
Go on Nicolas, give it a try!