3-5-2 flat ( if you wanna go defensive ) or 3-5-2 V style ( offensive ). If I were you I will used 3-5-2 flat defensive even if you have a bit stronger players.

Tactics:

Team mentality: Defensive
Focus Passing: Mixed
Pressing style: Own half
Tackling style: Normal
Passing style: Long
Marking style: Zonal

Force counterattacks: Yes
Play offside traps: No

Arrows: Red arrows= AML/ML and AMR/MR , Blue Arrows= No blue arrows. No need to put any blue arrows on your 3 DC's, beacuse they will stay behind no matter what and no red arrows on your 2 Strikers because that is their natural role and will keep attacking. You may put Blue or Red arrows on your MC or MC's but I don't suggest that because leaving them on neutral mode, your MC or MC's will not attack too high on the field leaving your midfield expose, and you can put blue arrow on your center MC so that he drop down a bit on your midfield to help your 3 DC's on defending. And being on defensive mentality with counter attacking with long balls will caought your opponent offguard in some points. I hope this will work for you, if does work for me so far. I am using different formations but my team mentality is always defensive and I am 22-0-0 so far....22 wins 0 draws 0 losses so far.