Patience is a virtue.
Have you tried using a shop-vac to provide suction to help you see where the liner needs to be adjusted?
The center seam should be what you use to center the liner. If that's not working, use the vac to help you see how you need to adjust the liner. Wrinkles in the floor may require you to excavate more material out of the bottom.
If you have any questions on what I've said - ask and I'll get back to you.
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