Kun, something I was thinking, I remember last year on fm14, for the two tiki tactics I used (yours and someone elses) I made one adjustment and I feel made the tactic much better, as well as closer to the real thing in life. I made the tempo higher. Yes, Barca and the tiki are possession based, but they are by no means "slow" about it. They move the ball up the field pretty fast and have quick attacks. Their high rate of passes is due to quick movement and decision making. They do not hold onto the ball, which is what a slow temp will want them to do. If you look at film on them, like that youtube video a poster posted yesterday, barca is very quick, both in their movements, decisions and passing. But, in this tactic, you have the much lower tempo selected. I remember last year I changed that to make the tempo higher and it did wonders.
They are a high possession team not due to slow tempo and keeping a hold of the ball. They are a possession by the high rate of passes through quick movements, and basically setting up that passing triangle and playing monkey in the middle. There is nothing "slow" about it. Their tempo is quite high.