It's interesting that I also use a 41212 narrow at this stage, I think if I was you, I would change some aspects of this tactic:
1. I think your left flank is too aggressive, no one is in defending position. If you are coaching a dominant team that is OK, if not, it would be better to change the FBa to WBd or FBs, otherwise you could change the mez.
2. F9 is the kind of forward that stick to center, he would never go wide to get ball. I don't recommend using f9 in a narrow formation. maybe you can change the f9 to a DLF or PF or CF.
3. In a narrow formation, I don't recommend using wbib, here are too many players in the center, it would be very easy for your opposite to do counter things.
4. If you are using a normal team, maybe change the SS to AMa or even AMs would be better for defending. I highly recommend AMs+AFa+PFa or AMa+AFa+DLFs, it depends on your player.
It's interesting that I also use a 41212 narrow at this stage, I think if I was you, I would change some aspects of this tactic: 1. I think your left flank is too aggressive, no one is in defending position. If you are coaching a dominant team that is OK, if not, it would be better to change the FBa to WBd or FBs, otherwise you could change the mez. 2. F9 is the kind of forward that stick to center, he would never go wide to get ball. I don't recommend using f9 in a narrow formation. maybe you can change the f9 to a DLF or PF or CF. 3. In a narrow formation, I don't recommend using wbib, here are too many players in the center, it would be very easy for your opposite to do counter things. 4. If you are using a normal team, maybe change the SS to AMa or even AMs would be better for defending. I highly recommend AMs+AFa+PFa or AMa+AFa+DLFs, it depends on your player.