It actually looks like it has more rudder area than my magic does, or it might just be the picture. It might also be a bit further forward that the magic. It sounds like you have the cg a little forward. With the 46 in the nose, you have to counterbalance alot of weight and force at the tail to overcome it. Can you move the battery pack backwards some? I noticed that my magic has awesome rudder authority at lower speeds, but is terrible at higher speeds. If your balance checks out ok, then check for any slop in your linkages, or actual flexing of the vertical fin and rudder. Try putting on some small tail wires, I used .024 music wire, and 4/40 screws with aluminum washers between the wire and the wood, and went all the way around. The #1 complaint I have read on the magic/limbo dancer tail setup was that they flexed under large deflection. I could see where that was going to be a problem on mine, and put the wires on right from the getgo. How much throw do you have, low/high rates, and total throw?

If all else fails, build a larger rudder, and angle the lower rear portion, to clear full elevator deflection. Try adding 1inch or so, maybe 1 1/2 inches. You could build that out of solid sheet balsa if you have lead on the tail, and remove some of the lead.

Good luck,
Steve