Thanks for your reply.
I've been playing with this tactic yeah. I noticed the the much higher tempo sometimes is too much for my players, but that is the style I want to implement, so I try to keep it, even though it leads to some mistakes.
Like you've said, I make sure that my supporting players have not only a reasonable work rate and teamwork, but also bravery. I find pace more important to the attacking roles and BBM.
Regarding a right side player push further up, you mean a attacking duty? Even though the WB is on support, he also has the trait to"get forward", so I think he still get far forward, and he really has to, to provide width on that side, becasue the WM sits narrower. Also I don't like too much to play with an attacking role like FB(a) or WB(a) as it tells the player to cross too much and I want to avoid that. I also want to keep the WM on a support duty so he can be a better supply to the PF
One thin that I've been noticing though is that the left side sometimes gets too congestes, with the IW(a), BBM(s) (he also has the traits to "get forward" and "gets into the area", so he is really aggressive) and DLF(s) compete for the same space in some situations. That's why I have now the IW(a) with "stay wider" PI. I could switch the strikers roles, but then the PF(a) would be on the same side as the IW(a) and that would bring problems too, as the IW needs space and that space would be limited with the PF on the same side.
I really like the 442 formations and I really hope I can make this work for this long term save, not only that tactic but the playing style I want to implement.