I usually play possession too with Ajax, but in fm08 it seems impossible to get more than 55% possession and attack..
Almost every oponent I encounter plays possession football (home and away). And they ALWAYS pull it off! Its unbelieveble when a team like 'de Graafschap' (just promoted to the Eredividie) has 60% possession when I'm playing at home
All my oponents seem to man mark (?) all my midfielders and attackers, making it very hard to pass the ball around on the midfield and up front..
You need a high tempo to get trough with lots of creative freedom, but thats almost impossible since you need a slower tempo to get some accuracy so you can keep possession.
Almost every faulty pass gets intercepted. If a player keeps the ball for too long because he cant find any options to pass to, he either losses the ball because they apply pressure or he blindly passes the ball somewhere up the field.
When they have the ball my players do apply 'pressure' but they dont attempt to tackle. Sometimes players from my opponent dribble very slowly with 2 of my players in front of them (doing nothing) for 2 minutes! No wonder they have more possession
In other words, you cant play possession football in fm08. Your players dont take the ball from your oponent but your oponent can take the ball (very easily) from you when you try to build up an attack.
If you play short with a low tempo your players will lose the ball because they dont have any options to play too and if you play high tempo lots of passes will be intercepted.
Every oponent makes sure they minimalise the space on the midfield, making it even harder to pass the ball around.
The best tactic to counter this is doing the same thing they do, minimalise the space

Push up your def line a little, keep a narrow field, play high tempo and use a counter attack. Always keep at least 5 players behind the ball to make sure they cant reach their forwards. And if they do, the forward has to beat like 3 of your defenders.
At the moment I'm playing with 3 central defenders, 2 wingbacks and 2 defending midfielders. The wingbacks make forward runs, while the central defenders and defending midfielders stay back at all times. So far this seems to work, but its an awfull way to play football... (they usually get over 60% possession!! But I get the 3 points)
Thats why I'm gonna wait for the patch and hope they fix this.