The DIS boxes are all capacitive discharge, AFAIK.
I don't think the thread creator has tested the limits of his current ignition system, I suggest he does just that before trying to cure a problem that does not exist. A lot of things could be wrong in the tune of an engine to cause mis-fires, not to mention ignition plugs, leads, coils and ignition boxes. From what I can tell this setup is very potent and should hold enough spark for 200 hp/cylinder if necessary.