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Keeping all your fans on a separate circuit seems like a very bad idea to me. Heres why:
The idea behind keeping your fans running on a separate circuit is to keep the FETs cool, no? But by adding another circuit, you add another layer of complexity. It's another system that has to preform %100, %100 of the time. You are setting up a situation were a minor fault, like say a breaker coming loose from impact, could fry _all_ your victors. You are putting some very expensive eggs in a fragile basket for a fractional performance increase in a all ready adequate cooling scheme.
Leaving the fans powered from the 12v input is a much safer way to go. When that victor is on, that fan is on. When the Victor is generating heat, the fan is helping get rid of it. No questions. That is reliability.
When you are wiring an expensive piece of tech like a victor, stick to the wiring diagrams in the manual. IFI really does know best in this matter. If the victors are getting that hot, then you have problems that arn't going to be fixed by those fans.
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