Hi,
My opinion, there is no magic bullet to fix it and I find that it's conneced with your players' quality... just improve your team and you'll see that the better your team is the less goals you concede
official SI ingame editor isn't the only ingame editor available
there are many other ingame editors around like FMRTE or FM Scout editor
also, you can get any results you want by savving before matches and loading the save if you lose :)
Why do you train them as Wide Midfielders?
Btw, as far as I know players can only complain about training's intensity and they never complain about the training's focus.