I seem to be having a bit of trouble getting my liner installed on a 15x26' 54" depth oval AGP. It is very tight in a few spots against the wall. Really, I mean its tight so much so that its tough to feel the wall as the liner is pulling away from it. All of my seams are pretty straight and parallel to the pool walls, and I don't have much slack material (maybe 1" all around) left draped over the wall, so I'm not sure what I am doing wrong. Anyone have any thoughts? Thanks!