Are you sure the liner is too big? It is a j bead or overlap? Unless it's a doughboy,lomart, or Kyack (which are precut for specific hopper demensions) then I assume it is an overlap If it is an overlap, then you should drain and reset the liner. Try using this link: http://www.arthurspools.com/poolencyclo ... salbum.htm
This will help you get started correctly. Also, most agp's with an expanded liner "will" have wrinkles. We wound up with a few and worked them under our steps.