The pool installer drapped the top of the liner over the wall and down the outside of the wall. The liner is held to the top of the wall by rubber channel that runs all the way around. About 14 inches of liner is visible on the outside of the pool. Can I safely trim off the excess liner? Im thinking that if I leave about 2 inches of liner under the top rails there will be no problems with future shrinking or movement. There is too much liner to just bunch it up under the top rails. The pool has been up for 5 years and has water in it.