I synch'd mine at 2500 rpm. With the air filter tops off, I was measuring airflow at 2500 and also looking inside when I found an accelerator pump issue. My accel pumps were adjusted wrong and uneven and one was dribbling a little. This helped attribute to my surging at steady state and off throttle - normally around 2500 rpm. I checked the airflow at a few settings up to 2500 to check that the linkage angles were right and things were tracking the same. I used a digial protractor I had to set the angle on the down rods the same to start with.
Ultimately, it was running great until half way through the first drive - the CB Performance arms are soft metal (Al) and the lock screws backed out and the arms moved. I have since use Loctite 222MS and also installed hose clamps on both sides of each arm to prevent them from moving.
Since then, no problems.
Mike