I'm using the combo tactics, i find combo2 hard to win games with often draws. Sometimes lose or win with one goal.
I bought pjanic for 10 million euros
A real deal I think.
I think you also should pay attention on getting some strikers and centre backs just in case they are not good enough.
And maybe try using both 1combo and 2combo in 1 match. Like score with 1combo and switch to 2combo/defensive. Because 2combo is a counter tactic so using it with a weak team will not procedure many goals.