Hi homer, still working on mine. I haven’t had a chance to get back to it. I need to clean and lubricate the back section. The seal is meant to be firm. Mine was going back up too at one stage at the front but your talking about the rear I think. It would happen sometimes and not others.You need to make sure all the moving parts and rotating joints are well lubricated. Also, the flat part of the tracks. Any major friction on the tracks will result in a poor opening. I used a certain spray lubrication that I discovered from someone else that fixed there sunroof. Over many years all the parts get clogged with micro dirt, etc. Actually, it is amazing that all my plastic parts haven’t crumbled over the 20 years. I think the rear gap you are talking about gets closed automatically when the full roof seals up. I suggest if you try and force it you may break one of the plastic parts in the roof mechanism. Did you get a genuine seal? I’ve found non genuine parts on this type of car (eg door actuator, lock, etc.) cause issues with them being slightly out of spec. Anyways, I will be posting back here when I get this job done. Hope you find an answer. cheers

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2005 X5 4.4i M Sport
2003 X5 4.4i