About the possession bonus, I'm not so sure how it works. This season I noticed that sometimes a full stadium gives you 5% bonus and sometimes it doesn't. In my champions league I had the 1,5 K stadium capacity and on some games I had 5% bonus for 1,5 K people and on some other games I didn't... I don't know why this happened.
Click image for larger version.  Name: possession.jpg  Views: 46  Size: 83.3 KB  ID: 26104