Interesting results!(posted 8345 days ago)I don't understand why the 6x9 condensor should have more problems with unevenness than the 35mm condensor. This makes no sense, but I will take the word of Meopta. Is it possbible that the condensors are installed upside down? I would expect much more fall off in that case, but it is worth checking. What aperture are you using for your test? This lens should work best at around f5.6, but the light might be more even at smaller apertures.
I am not familier with this enlarger, it is possible that this is simply the best performance you are going to get. You a great enlarging lens, I am sure that this is not the problem.
Did you purchase this enlarger new, or used? If it was used, you may want to get a manual and make sure that the enlarger has been assembled correctly.