Wonder how could you make work that monster pipe with that machine?? I was using the same hatori sb-50 tuned pipe and could never make it work. I had to go back to the one that came with the kit. What do you mean by notchy??? I can tell you that I also have some tail problems on my Sceadu. I´m also using a GY401 gyro with 9253 servo. It is working fine, however the gyro and transmitter sensitivity are working at the max limit possible. Is that the same problem you have??