Also, I'm a noob so take this with a grain of salt, but your bird has a delta wing, and I don't see many delta wing builds with a rudder, most are yank-and-bank. If there's a way to make that rudder useful on a delta build, somebody more experienced than I will tell you, but from where I'm standing, you might want to consider going without a rudder, and maybe trying to get the banking to respond to a bit faster to a turn and still be stable. How you would go about doing that, I can't say 100%. I'll take a closer look at your build and see if anything comes to mind, or if I overlooked something. Like I said though, somebody with more experience and knowledge could probably clarify this issue better and give you a solid solution.