Turning wingers to wing backs means your CBs will be too narrow instead of covering a bit more of the wings and against teams playing with on striker you got 3 against 1 in the middle, the wingers help battle for possession higher upfield. But Whatever works for your team.Even though you said not to. I have found a bit more solid defence in putting the wingers, a slot down, as Wingbacks (attack). I believe that when not playing an absolute top tier team, the defence struggles a bit - that's what i saw, getting beaten 3-0 against PSG and Atl Madrid with F.C. Copenhagen.
i also changed the back-three roles, with a Librero (support) and 2 BPD(defence) on the sides. i'm not sure if this is the best setup - but the central defender got beaten to often, in my team.
But i love the build-up play, with the 3 midfielders and goals are lovely!