i just played against an similar team, with exact the same 3-4-3 formation, and thi team was not weak at all.

i used this formation : 3-1-3-1-2.

dl - dc - dr
dmc
ml - mc - mr
amc
st - st

dl and dr up
ml and mr up

normal mentality
passing trought the flanks
mixed passing

i won 7-1


i hope it will be helpull for you