I was thinking the same thing Che on Arzo, no idea what has gone wrong with him and why he has never been used, but currently Lambro and Kolo are doing a good job so I wouldn't change them.
The team I had in the 4-4-1-1 wouldn't require both Johanssen and Simeos to attack, Simeos can be box to box he is capable of that. It wont expose us though, it doesn't allow teams to go right through the middle and would force them to go wide or long.
As for 4-3-3 we are told to play it here in NSW Premier League (FFA has endorsed it) but I refuse to play it as it leaves you very exposed in areas and after watching us against PAOK and how they ran through us all over I don't think I ever wana see us play that formation again UNLESS Poyet plays it a different way and has us very organised all over the park.