yes you can do this m8

In my opinion and my following words supposed not to force anyone to accept it but anyway see what I'll say:

*- If you are strong team and your team is always full of 5* player and more than 5* players then you can use any fixed formation/tactics for all matches and during the whole season.

*- The stability (in my opinion) is a key element in making the victory or the continues wins; If you decided to use a specific formation with fixed tactics and also specific player in main squad for along time, it will be too much useful and will generate continues win.