I didn't check your math, but I think you are making a mistake. If you mount your magnet/rotor combo so that the spark occurs at 32 degrees, and you only have adjustment clockwise with the sensor, you've got a problem. Moving the sensor clockwise will only advance the timing. If you are already at 32 degrees, you won't be able to back it off. Moving the rotor clockwise would retard the timing, but moving the sensor clockwise will advance it. This is of course assuming you will be using standard counterclockwise rotation of the prop as you face it.

The reason we got carried away with the points thing was to address your question about a possible spark delay with points.

Hope this helps,
AV8TOR