why can i run so much initial timing

oliver said

you cant use a digital dial back timing light with an msd box, the multi spark messes with the light. Any analog type light will work better.

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This has been my experience.
I was told to use this and I have no problems anymore.
http://www.jegs.com/p/Flaming-River/Flaming-River-Self-Powered-Timing-Light/748169/10002/-1
As a side note , if the wires are reversed on the MSD pick up ( sometimes from the factory like this ) it will cause havoc with your timing.