I would use either 4-1-3w-2 or 3w-1-4-2- 3w-4-3 or 4-3w-3 and use mixed passing style. through the middle, close down whole pitch, force counters, hard attacking. As he is playing a diamond in midfield he is leaving a huge gap in the center as he has no MCs so a formation with one or two players in the middle can exploit the whole!, having wide men yourself helps to combat his ML, MR, and if your concerned about his two STs and AMC then start with 3 STs yourself. Me personally would start with 3w-1-4-2 or 4-1-3W-2 then take off my DMC at half time and put on another ST in the middle.