I guess I think a little better explanation of the twitchy/unresponsive comment might be in order. I've never needed to adjust any settings on my radio to get the type of control I want other than adjusting travel/endpoints. If you're turning full right and it takes its sweet time to turn or doesn't turn very sharp, that tells me either there isn't enough throw or not enough surface area on the rudder(s) to get adequate control. If it turns too quickly or too sharply and spins out easily, perhaps the rudder has too much throw.