Definitely think the three at the back gives us more, especially with Schar. Just seems to get the most out of him. Clark aswell, despite obviously not being as good, seems to like it.
I'd try make it our base going forward I think, with everyone fit, I'd probably be looking to play this:
------------Dubs---------------
----Schar---Fede---Lejeune
Yedlin---Ki----Diame---Ritchie
-------Ayoze----Muto-----
----------Rondon-----------