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I've looked into Schottky diodes, they only barely give you any improvement because the higher reverse leakage will eat away some of your voltage.
The right way to do it is an active rectifier, use a bunch of big MOSFETs driven by a synchronous rectifier circuit. Depending on how much MOSFET you have, the drop can be cut to a fraction of a volt.
I think the larger Denso square conductor alternators that are pretty common nowadays can push 200A+ if modified. They have 40% lower copper loss than other alternators. Using active rectification on that would work well.
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