the 15psi was corrected a long time ago. The CDI ignition fix is very old and now outdated. The fairchild ignitors have been tested to 22 psi and function correctly at 10 ms dwell. the flipside to these ignitors is that they have no current limiting, which means if you adjust the dwell to high, you can damage the MS due to its lack of ability to carry that much amperage.

Check to see if your spark output is inverted. It needs to be. All MS's i have built in the past year with internal ignitors have the Fairchild ignitors.