I feel this is something you have to take up with Czech CAA, I have a friend who just did the exam with IAA (Ireland), no issues whatsoever, graphs clear and readable, answers with decent margins in between them, just like in my exam with UK CAA.
If the Czech CAA are not using the same question banks as UK CAA/IAA and possibly rest of the EASA, then there's no surprise your EASA lady seemed a tad bit ignorant. As far as I know, the problem you describe used to exist years ago, but now seems to be fixed, therefore from her point of view the problem really doesn't exist and you're just some bitter student who can't get it right..
I would recommend rally up with other students in the same boat and demand your CAA some explanations