I’m just a level 6 newbie, so what I quoted below may not be useful, but just for your reference.
Counter formation suggestion for stages in the currently live event (depending on availability of player positions):
5) 4-1-2-2AML+C-1, 4-1-3-1L-1, 4-1-2-3AM
6) 4-1-3-1-1, 5-1-3-1AM, 4-2-3-1AM
7) 4-1-3-1-1, 4-2-3-1AM, 5-1-3-1AM
8) Same as 7)