I would use 3Dw-2DMC-2MC-AML-AMR-ST
or
3Dw-1DMC-ML-2MC-MR-2ST (or AMC-ST)

but I think he has the right "chemistry" he found, not the formation.

Try to find from older games, which oppo formation gave him a hard time and which (possible) mentality his oppo used.