My soil is a natural sand I dug it down to my 52" wall height and put my 6" sand cove all the way around also putting gorilla pad down my question is do I need to add more sand to the base as I see everyone adds 2-3" of sand am I gonna have a problem with my liner not fitting correctly by not not adding the sand and keeping it exactly 52"? Using a unibead liner, I measured the liner and from top of wall to cove Seam it's 45"(my cove is 46" to top from top rail) do I need more sand or will it stretch that much