I'm not pro but I'm just giving my idea to beat 3n-3n-3w-1

If we break the formation then we can see this formation load with 9 (3n-3n-3w) def. and 7 (3n-3w-1) attacking players; I think, to beat this high def. we need a formation with equal numbers or more attackers at the same time we need to def his lone ST or stop his midfield to provide ball to ST:

4-1-4-1

This formation with red arrow on dl/dr can give us 8 attackers to break his def and at the same time 2 dc with dmc can hold his ST, also you getting 9 (4-1-4) defender to defend him. Or

3n-1-5-1

This one give us 9 defender when defending, and 7 attackers when attacking.

I don't think any AMC related formation can work as he using 3 dmc.

Again I'm not 100% sure but the way I counter any formation I just share.