When i'm winning by 3 or 2 (depending on opponent), i change the FBs that are in automatic, thus having the mentality chosen by the main tactic, to support and the d-line gets much more stability, without loosing attacking efficiency.
Changing the mentality to attack will make the team slower, concerning all movements, because they are not eager to get the ball (overload mentality has this is the description).
Having a mid of 3, with no support from the 3 upfront will make the team unstable (the 3 in the mid have to cover the FBs) and less speed is putted in getting the ball. Most of the shoots i receive are from combinations (1 -2s) in the mid, with no support from the attackers and it does not result in more goals against me because im that god!
So, to put attacking instead of overload you would have to get the 2 F9 from left and right to track down the FBs, making them unavailable to pressure the 2 in the mid (opponent CBs) and gain leverage, drag them out of position to the lines, etc. You may try them as raumdauters in AML/AMR position and see if it works, but as definition, this role don't defend, so it wouldn't track down the FBs....
Im trying to recreate this tactic with one in the back. Yes one (1)! Then in the DMC position, 2 HB and the rest and it is. In theory, the pressing in the mid will be so huge that i will recover the ball very quickly in the opponent midfield and if i loose the ball in the midfield, i will have 3 CBs.
Care to try this with attacking mentality to see if you have more balance?