I dont really know tbh, i wanted to change but its working perfectly so i left it. Myabe you can test it with different trainingAveraging 4 goals a game exactly is impressive, even after only 19 games.
One question, why during the season do you use tactics only match prep? Once the tactic is 100% fluid, it's useless.
It would be but you'll need an extra CB a DM and more playing strikeris it this tactic suitable for arsenal