I would suggest moving them to the back wall then. As a LEDE design concept, the front wall is usually bare. Wait, you had an "L" shaped room right? hmm... I'd still get as much off of that foam off the front wall that you can while keeping your flutter echo problem at bay. Do it in a checkerboard pattern. Keep the opposite wall clean. I would recommend the front wall bare and absorb the back wall. Better yet, use some of your new traps and completely bail on the foam. Really, in most cases that foam stuff only hurts due to its extreme narrow band of useful absorption.