Yes, those peaks should be equal heights.
You can download the Riders Service info
here courtesy of the ETF.
The horizontal oscillator and AFC operation are described on page 14. Horizontal oscillator adjustment is described on pages 20-21 including a little picture of what that waveform should look like.
You might gain some insight from this video where I troubleshoot the same oscillator circuit running too high:
http://www.youtube.com/watch?v=YXWX1YasFk4