As mentioned, it was very nervous and twitchy.
Here is where I found the way to do it http://rc.runryder.com/helicopter/t5...hlight=450+fbl
But when I tried the RJX head it was like getting a totally new bird.
Trex 450 Pro Stretch Neu Scorp 1630, 8s, CC30HV. Mini V
Trex 700 DFC V-bar