Need help with inconsistent tactic fm20

Evening lads,

This is a tweaked tactic, first season I finished 8th with Schalke, this year is going rubbish and I'm bound to finish the season without any European qualification.
The problem is that we are really inconsistent and I was wondering if you guys could shed an eye on the tactic and maybe provide me with some usefull feedback.

Corner' s and high throughballs are my most common conceded goals, once i score the 1-0 the game is normally in the pocket. however when I don't score in the first half I can already predict the outcome of the match.
My squad is young, I know this has something to do with it as well. But there must be some tweaks possible