I'm not sure if this will help, but the ECU on my RS can handle 310's. Any higher than that, and we have to have a SAFC. I'm sure the SAFC is much cheaper than the Hondata or whatever. Good luck man.
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Olympus Evolt E-510, E-520, E-30 x 2
11-22mm f/2.8-3.5 Zuiko Digital
14-54mm f/2.8-3.5 Zuiko Digital
35-100mm f/2 Zuiko Digital
50-200mm f/2.8-3.5 ED SWD Zuiko Digital
Cybersync wireless trigger
FL-36R, FL-50R, Metz-48, and Vivitar 285HV x 3