Hi Klas,
I think that clumps like these breakup the stiffness better than single grasses, the problem is still that with many of those clumps next to each other, the overall look and feel is a little too chaotic (blades pointing everywhere). I should have said, that I would like a look such as a breeze of wind would do to the grass. I don't think this can be done just through the models.
However, your grass clump looks really nice. One suggestion, in case you would want to consider it: the brown and tall blades are too long (I think). Half the length, or 60% of the length, would be better.
Grüße,
Frank