Hmm, mostly low corners that lead to the opposition scoring a volley or easy tap in. High corners are usually dealt with better. I don't think it's an issue with my players because I've been using this tactic in my new PSG save and I had the same problem. Speaking of my PSG save, I had great success once again with this tactic (won treble):
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I also reached the semi final of the Champions League where I drew with Real Madrid but was eliminated due to away goals which isn't a bad result at all. I was kind of expecting them to beat me by 2-3 goals. It's a shame this thread isn't getting a lot of attention because this is definitely one of my favourite tactics.
Edit: Forgot to say that I made one change to the tactic. I added the 'Work Ball Into Box' team instruction because I noticed that a lot of my shots were off target and my players were wasting too many chances.