I never heard of wrinkles with an overflowing pool. I suppose it might depend on the construction. We have very porous ground (sandy gravel), a 200 foot deep ground water level and a porous poolcrete pool bottom (under the liner). If any water gets behind our liner, it's draining straight out. Even if there were some wrinkles, dropping the water level will allow the liner to be readjusted.
There are some really crazy customization options with a vinyl liner.