Noriah

Could you add a drawing of what you do for the lid? The clear materials make it very difficult to see what's going on. A demonstration in an opaque material like a few colors of construction paper would also work.Also a diagram of the position/orientation of the hinges relative to all the sheets would help. Showing the folding process step-by-step in the first/completion step would clarify the relative position of all the parts as well.

A successful experiment deserves another, as it were.

Another few variables to try:- Letting the dough rest on the counter after you finish mixing, so the liquids absorb into the flour- Chilling the dough after mixing, since the butter would firm up, perhaps making the dough flakier. This is a technique used in pie dough- Another pie dough technique, adding a little bit of alcohol to the dough makes for a better texture