I feel like I'm seeing the same thread time and time again
If you want an IF/IW or any wide role to shine, you need to give them space and supply, it's FM 101
Having 3 out of your attacking 4 on Attack, isn't really prioritising any role. The CF is a good idea but he's still on Attack, he's the highest positioned role on the team so he'll be in a good position to score goals Leao could be scoring. Scoring goals = ratings
You can use roles and TI's to create overloads to free up space
See back to when Liverpool where actually good and how their system had Salah banging in the goals in a 4-3-3 DM
Personally, I think the 4-3-3 DM is a better shape than a 4-2-3-1 to really get the best from a wide attacker
4-2-3-1 is still decent, here I spent a season with the Wide Target Forward, I really had to think about how I could get the best out of the role and factor in his limitations for the benefit of the team
I did the same with RMDs and IFs but because they're more mobile, I used 4-3-3's for them