I have used 2 different formations successfully vs this formation and butterfly was not one of them, although i have read in this forum to use it.

I use:

3N-3W-2N-1-1 and 3N-2W-3N-1-1 and both have not let me down.

--------ST---------- -----------ST----------
-------AMC--------- ----------AMC---------
------MC--MC------- ------MC--MC--MC-----
-DML---DMC---DMR- -DML--------------DMR-
----DC--DC--DC---- ------DC--DC--DC-----

Please let me know what your result is, regardless of what formation you choose to use. good luck