RE: trex 450 sa setup
if i'm not mistaken, thats what i started with. i have since moved up to the 13 tooth and i have a 220mm flybar with carbon paddles and no weights. this setup is very responsive yet it has a fairly stable hover. don't get me wrong though, you will be very pleased with your current setup but, once you decide you want to start working on some 3D, you'll want to go this route, maybe even take the flybar off, lol.
good luck,wraith