How do you tell if they are attached or glued together properly? Mine is a little different but the same type of set up. The inner liner is a different material and the outer as well. Mine looks like Blair's without the skulls and mine has the inner socket liner.

It depends upon the suspension method... if it is a pin/shuttle lock, no attachment is needed between the flexible inner socket and the laminated outer frame. If suction the valve will be in the inner, and that will be (most likely) velcro fixed to the outer frame. Some sockets hold together simply by the shape, like legos! (esp. trans tibial - BK)

Leigh, mine are glued together, my prosthetist explained it to me that if there is any air between the two sockets then this can cause a loss of suction, and actually when I first put the socket on before it was glued, there was movement between the two parts. There shouldn't be any movement between the two. From the way you've explained your problem to me, it sounds like your socket is too big, and the one suction part just isn't making good enough contact to keep good suction. The 5x liner might help, because there are more parts to make contact and cause the suction, but if you can put your hand all the way down and feel a gap between the liner and the socket, that's just loose. You should have a good snug fit. I'm sorry you're having such an issue, I know it stinks to not be able to use your prosthetic.