Hi and welcome to the forums, Oleg,
I tested the AMP 11.9 and didn't have the jellyfishing.
My bladder was pumped up hard.
If it collaps you have to check the trim. The AMP works on a very short way, about 15 cm from full power to full depower.
If you depower it too much, it will collaps for sure.
Just try again. And I think in very gusty winds almost all kites jellyfish.
PS: I saw you profile picture. What bar is this?????