My interest in ignition has been revitilised (thanks Arge). I wanted to go through the Battle2Win data above, for me there are a few unanswered questions, one of which is what curve is in the standard S1 ignition unit.
I bought a programmable signal generator off EBay some time ago, maybe a month, and it turned up today. Whilst Ms Pash is at work, I have turned the dining room into a lab and have made the signal generator replicate the CPS output when working with the trigger rotor from a carbed Buell.

Next job is to connect the igntion units up one by one and measure the time between the Low-High (TDC) and the High-Low of the ignition output (to the coil). From this I can work out the degrees advance.
Looking at some data from some ignition work I did (when I worked in automotive) in 1997 with a Vauxhall Astra ignition unit and coil, the time between trigger (ignition box high-low) and breakdown (spark) is about 25 micro seconds, which is about 1 degree crank angle at 6500rpm.

This was for a 5kV breakdown. The coil was quite big, so it is possible that the inductance of the Buell coil is less and hence discharge is slightly faster leading to a quicker breakdown.
I'll be using 25 micro seconds as my 'time to spark'.
As the time to breakdown depends on the breakdown voltage, and that this is sensitive to pressure (high pressure = high breakdown voltage) and temperature (high temperature = low breakdown voltage), we could be in error, but I wouldn't expect this error to be any more than +/- 1 deg CA at max speed.
Testing will start Sunday...