Kevin, I find that the throttle gives me the most problems. I've found that the best sequence is to set up a servo arm that is the same length as the throttle arm. Set you servo up with 100% travel and no expo. Set both end points at 100%. Now with the linkage loose, go full throttle. Swing the throttle arm to full open and tighten things down. Now one thing first, make sure your idle stop is backed off, and from the sounds of your ability to kill the engine, it must be. Set the throttle at idle and make sure it is really idle. From here on, you need the engine running. The top end should be OK. You can tweek the end point to get full throw, making sure you are not stalling the servo. The idle should adust with the trim now. and shoot for netural trim if possible. THe kill should shut down enough to kill the engine. Just remember that the trim on throttle only effects the idle end of travel. Once you get it set up so the carb is wide open at full throttle and the closed with the kill, you should now have linear travel on the linkage. The engine will react differently, so now you can play with the expo and get the RPM curve flatter. The key is to make the throttle and servo arms equal so the travel is the same

Don