I have a 130cm dish and Inverto Ultra Black lnb pointed at 7E, the only way I got Animal Plant to stop cracking was to place a screw type home made adjuster to hold the dish firm. It worked for me. Pictures to follow.
Martoxxb, that i interesting, so the Ultra Black Inverto LNB you say works best but the part of home made adjuster I do not understand, a picture will drive it home.