If team cohesion is good, tactical familiarity is good, and morale is good, then go to tactics.
Your morale needs to be better, so try to regularly praise/warn them for training performances, praise for conduct, and that will help.
So, tactics: First look at your instructions, and pick a player. Imagine how your instructions would work for them, what teammates they would have nearby, and such. Imagine you being that player.
For example, your Left Winger, Clark: Let's say he's given the ball from the defenders, and wants to move forward towards the opposition goal. A winger dribbles, attacks the defenders, and surges into the final third. But you tell him "Pass shorter, don't dribble much, keep the ball and work it into the box, focus on playing in the middle, and go slower." Well, the other team is closing him down and putting him under pressure, he's trying to follow your instructions, and Keefe(CM-A) has gone forward, Cotter(CM-De) is sitting back on the other side of the pitch, not supporting him, Knight(P-A) is sitting on the line waiting for a ball to hit at goal...so what does Clark do? Either punt the ball long or lose the ball to the opposition.
That fits with what you are seeing: "every player is playing long aimless balls, every player makes strange short passes to no one which are abruptly intercepted".
Keep doing that with the other players, and see if you can change your tactical instructions.
Then, take a look at the goals you conceded in the past. Why did they happen? Are your defenders under too much constant pressure? They're in wrong starting positions? They have poor composure or aren't consistent? Maybe you can change roles and/or train certain attributes to help them perform better.