Today I discovered the root cause. The way the beam tubes are constructed IMPEDES the correct set up of the rack. If you follow the way they're built and match the dents on the beam tubes with the plastic holders you will end up with the legs of the rack NOT being parallel between each other. That is, NOT vertical to the ground. In other words the rack will end up looking like a Gaudi design with the only difference that it won't work.
Sorry being late on your post, but had forgotten to answer.
My DM10 Studio kit looked the same like your "Gaudi" kit during my first 20 minutes of trying to assemble it as a totally newbie on edrums. Then I realized that the diagonal beams have their own "physics" and I rearranged them not looking into the quick start manual, because I wanted to place my pads and cyms like *I* wanted them, not like the manual suggests.
I didn't screw the beamholders too hard, then I balanced the diagonal and straight beams to my pleasure (loosing some comfortable positions and re-assembling the holders again) and bingo - all went smooth and in parallel to the ground.
I haven't trusted quick start manuals or printed setup diagrams since I was thirteen and had build my first small model airplane.