I have them running totally fine, quite nice and simple and with good results. I'm using an RB20 ignitor pack on my RB25 series II
If you have tried all that and you are still having missfire problems, then the problem is something else. If everything seems to be running fine on idle and light throttle, but just gets all farty and missfirey on boost, then I suspect your problem is a boost leak. Obvious places are the intercooler and the actuator pressure hose...
Hope this helps,
James