Does the water ever get behind the liner if you don't drain it?I use the aquadoor on my pool and never drain it down. All I do to winterize the plumbing is install the aquadoor cover and put a 1.5" plug in the return. (I obviously do drain all of the water from the pipes afterward).
I use a simple tarp like cover that uses a cable to tighten it to the sides of the pool. I float a plastic 55 gallon drum under the cover to help keep it above the water. During the fall months, I syphon off the water that collects on the cover to help with the fall leaves. Once the trees stop dropping leaves, I don't worry bout the water on top. 15 years like this and no problems so far.
Here is a mid winter shot of the pool...
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