It looks like the top is fairly smooth. The back has some problems so I would re- do it. I don't know the best way to remove the back if the glue is already dry? You might be able to carefully lift the fabric away from the glue and use an exacto knife to shave off a bit of the poly fiber? Do not use a hot iron on polyester batt as it melts.
When I tried the Elmer's glue method, I did the front first and the back last. It is more important to get the back smooth because you can quilt out any shifting on the front when you see it.