you have the latest patch, right?
I play on fluid until I am 2 goals up or more, and very fluid when I'm down
but btw never change tactics often, team needs time to adapt to tactics and you gotta be patient, like this season's juve

so if you change something give it time and dont keep changing
actually fm10 is waaaaaaay better than the ones before!
but i stopped playing over a month ago to get ready for fm11, and also because it sucks to play it after the new season begins
its very addictive though