There are college basketball coaches that will play 8v5 to get ready for an opponent with an up tempo style of play.
I took this approach for practice and playing out of the back. We took our goalie, 4 defenders and 1 CM against the other 11 with the 11 putting full pressure on the defense to score. If the defense made more than 5 passes prior to clearing and re-setting the game, then the offense had to do push-ups, burpee's, sprints, etc. It made for some very spirited games and very confident players during 'Showtime'.
From this I can see you are ready for the process which I refer to as the 3C's CONCEPT.
For any coaching session to be effective, I use the 3C's template:-
So, for all activities (Drills/Functions/Phase Of Play's/Small Sided Games) I will provide the 'Challenge' i.e. "The challenge is to score a goal within 'X' seconds after gaining possession".
Then I will introduce Competition (1v1,2v2, Team v Team etc.)
Then I will look for the best offering of what I am looking for and then challenge all to copy it time and time again.
I guarantee that if you have the 3C's in your practice you WILL see improvement not only in their technical and tactical development, but also in the shared enthusiasm from the players as they WILL respond to the healthy competition you provide.
Drills are fine for specific focused technical improvement but they can get boring for players.