Regarding throttle to rudder mixing. It's pretty common to use a little right rudder mix at full throttle on an upline, and sometimes to use a little left rudder mix at low throttle settings on a downline. For a little more comprehensive explanation look into the aircraft trimming articles written by Peter Goldsmith in Model Aviation a couple of issues back. Very accurate and pretty darn informative. There have also been some things written in 3D Flyer that cover some of this, but not as well written.