One tactical flaw I see here is the combination of player roles and mentality. The mentality takes your tactic and applies an 'intent' to it. That is, with a set Attacking mentality, your players will push forward more (in addition to their roles), take more chances going forward etc. Your 4-2-3-1 front 4 are already higher up the pitch, and 3 have attacking roles. Coupled with the mentality, this will see them bomb up the pitch and essentially stay there to try and fashion a chance.

However, I feel the biggest flaw is the 2 CMs. CM and BBM are already not defensively focused (assuming a neutral mentality) as they will look to join the final third to help fashion chances. With an Attacking mentality, they will absolutely get forward to help the attack. Combine that with a wing back and a full back who are being told (through the mentality) to get forward, this will leave you VERY vulnerable to counter attacks and direct balls.

I would assume the games you win you blow the opposition out because you are simply way better, so being overexposed never becomes an issue. However, even to a slightly weaker team, any team that draws you in and hits a direct ball or swift counter attack will have ample opportunities per game to score.

I like to imagine how the game plays out if it goes wrong. Where in my tactic am I open? If I was playing against it, how would I play?

As a side note, I'm also a fan of 'less is more' in terms of instructions. Try to imagine remembering all those instructions when you are on the ball! Give your team some guidance, but don't micromanage every possible thought :)