Still I have not come to a conclusion on this.

But statistically what I have observed (by collecting data from oppo's matches) is that the system I mention has many issues against the 1AMC-2ST combo.
It seems that the code checks that you have 2ST and AMC so let's say 2,5 attackers against 3 defenders.
I bet that the AM will blink telling him that his defenders will have problem against oppo attackers.

Now for defense I cannot imagine a better solution than 4dc-1dmc.
One alternative could be 3DC-2DMR/L but I am afraid of the oppo's amc and I have not tested this formation.

So at least for now it seems that 442nd could be a counter.

(and this comes in contradiction of the counter formation I use for 442nd which is 3dc-1-2-3w-1 which seems the ultimate counter of 442nd... ahhhh )