Think I've found my ideal set up for this now. Camera plays a huge importance, the game seems to have sprung to life when switching to tele cam (height 10 zoom 7).
My sliders are now set to;
Sprint speed 47/47
Acceleration 47/47
Shot Error 50/50
Pass Error 75/80
Shot speed 49/49
Pass Speed 46/46
Injury frequency 85/85
Injury Severity 60/60
Keeper ability 50/50
Marking 50/50
Run Frequency 60/60
Line height 55/55
Line length 50/50
Line width 50/50
Fullback positioning 50/50
Not a huge change to defaults but enough to slow it down perfectly for that particular camera view, and gives you enough time on the ball but also you're attacked by the AI quite nicely.
I've found with pass assistance set so high, it pays for me to put passing to assisted in the controls. Manual players will laugh at that but I find the more automated passing is, with the pass error set so high, the more you notice pass quality from player to player. Try a 40 yard crossfield ball at full power with my Virtual Pro and it'll balloon into the air, go wide of its target etc. Try the same pass with Xavi and he'll curl a beautiful pass that skids across the turf as you'd imagine he would. Not for everyone but I love it. Shooting, I set to semi, and through pass I set to manual. I also have the game on slow speed.
Tried some Spanish matches with these settings tonight and they were awesome. Beat Athletic Bilbao 3-1 with Barcelona then in the return match, Llorente punished my bad defending with a hat-trick as they out footballed me and won 4-1!
I'm finding on my settings that pass accuracy for the overall team stats really vary. The match I lost 4-1, the AI's passing was on 89% and mine on 80%, but a previous match with two Premier League teams both myself and the AI were around the 75% accuracy mark, which during a 14 minute match translates to a decent number of passes that go astray. The AI also regularly has an equal share of possession after 90 minutes, sometimes more possession than me, and that's something I've never witnessed in a FIFA game before.
Oh, I'm on Professional level too. I'd reccommend trying these settings if you're after a slower, more continental style of game
Speaking of pass completion, I've been looking at some stats for last season's Barcelona v Arsenal match and the stats were just as high as you get in this game, something I thought it had all wrong. Xavi finished the real life match with pass completion of 94%, Wilshere 87%, Fabregas 81% etc. That doesn't translate of course if you get the same stats in FIFA with lower ranked teams but at least it's realistic at the top end of the game.