I currently use Estes beam controller but looking to launch a cluster of 3 "D" motors and was thinking of upgrading to the Estes "E-controller" . Is there any actual difference in power since they both use 4-AA batteries? This is my first cluster, and when I tried a test fire on three igniters, with my beam controller, they took a bit to light and I would hate for one to misfire. So basically, do I need to upgrade my launch controller and which suggestions can anybody give me?