The game has become much harder indeed. I just had 3 very hard matches, but I managed to do well. First, I had Inter in the Serie A, played 1-1, altho I could have won (damn you Bobo Vieri!!!), then I beat Juve 2-0 in the Serie A, and Milan 3-0 in the Coppa.
I'm 3rd in the league with 4 points behind Juve and 10 behind Milan with 15 games to go. Milan is just too strong, they have like 21 wins, 2 defeats and no draws in the league. I still have a chance tho, I've played all the big teams already while Milan still has to play against Inter, Juve and me in the remaining 15 matches. I'm playing them in the Olimpico so I expect a win.
My advice to you is, if you have better players than the other team, just play the same tactics they are playing. My custom tactics always get beaten by Juve or Inter, so I just play their tactics or the computer's 4-4-2, and it works.