You are winning thats good. For me to much arrows. But if t is working for you then its fine.
I have never used this formation. But i have beat it a few times with 4-5-1V.

And i think with this formation you can play against some formations succsesfull trough the middle. But i think you play the most of time with mixed focus and that could be good to. You need good skills in strength and fitnes because of the arrows.

But what i say before. As long as you win your matches everything i good.