No, I don't play with an underdog team. I'm not that good haha.
Depending on the back four players, sometimes a L(d) if the player is a good BPD, others an IWB(d) if the player can play inside without losing the ball with bad first touches. And others I use a Carrilero (because he doesn't rotate upwards) on the same side of a WB(s) and IF, emulating Liverpool's righ hand side.
Regarding the Wingers question, I don't use to change too much based on opposition because when I do it almost always back fire But I think that If you keep your Wingbacks on defend duty, you are facilitating the Wingers job because they don't need to track back. You could leave one WB(d) to face their most dangerous Winger and be more positive with the other one, so you have 1+ body when in-possession and the opposition Winger has to track back. If he doesn't you have a free player.