logos--please show me the top of the plane too, when the belly plates are closed. On mine, the upper rear fuselage always "pops up" if the plates are closed fully.
I know the knees are not the problem on mine. I am well aware of the "extra click and the little hole". (I have actually fully disassmbled the knees for repair, and am very familiar with their inner workings---same for the backpack). If anything I think mine's issue is actually the grey metal bar. I think once I got it fully clicked in. Every other time, it's only like 90% of the way in but will NOT go further. That or the shoulder.
Though the part the nozzles are attached too, where the belly plates latch into at the rear--also always an issue. The plates often slip sideways out of position.
::edit:: Hunh. I just got this to happen, while maintaining "as good as mine gets" for the upper rear plate. (I seriously think my back plate has a mold flaw or something---it will NOT lay flush with the middle/forward section---I've got stress marks from forcing it)