Which back are you using, Rainer ? How did you get a sample that doesn't band or stripe ?
i used at first two,5 years before a sinar emotion22 which was a great back without any shadow defects. i added than in mai 2006 one of the first emotion75 which showed very unlinear colors. my friend stefan hess wrote first profiles for this back in his already existin g dng konverter,
then the colors became better. centerfold issue showed up soon,- foto-z was the first one who saw this in an image i had posted in the net in rgalbraight.
i returned the back and got a new one ( which i still use ).
the second back had much better linearity but still centerfold, but no noise or patterns in the dark.
i asked stefan now to think about if he could write a code to remove it ..... after 2 or 3 days he finished the first code ( !!!! ) which already was wrking very good, just needed some fine tuning with more backs ( stefan wrote around 50 updates..... ) . incredible no? he wrote in few days a code where the established companies till today have not been able to deliver one ( in fact all other solutions in the market are just "work-arounds"- cosmetic ). well --- sinar took over this code in their captureshop program and now in exposure. therefor they had very little image damage from this horrible dalsa sensor fault. BTW. it is also caused by too big tolerances of 3% between the different amplifier zones in the chip. i suppose the sensors are cheaper to manufacture with this hi tolerances and software departements in the companies promised to resolve this but ...... some delay... u know.
so .. long story. but in contrary to many others i did not accept the quality i found and searched for a solution. fortunately i knew stefan and he is really a sotware-star. so i got my own "custom" manufactored soluton ..... later we tweaked the brumbaer tools more and more till the workflow was in a way that it seemed to have some logic for my needs. not any proramm in the market delivers a workflow which i would name logical and fast,- for the needs of architecture shooting where you need to make many white references to have color free results.
somehow similar than your profile writing but brumbaer tools and so our experience are freeware. some photographers use them now as you probably know.
i just updated some weeks ago my old emotion22 to a 75lv as well, this back was good out of the box. not 100% as good as my old one but nearly as good- the new one shows this "hair" structure 11 stops down.
both backs have good bright oled display, these displais are very different,- some are perfect visible in sunlight and some are only usuable for histogram control. seems so that M.R. had one of these bad ones..... fortunately i have two good ones.