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i can't solve your problem, me being electrically challenged anyway, but i ran the alt. pwr lead directly to the battery with 150 amp fuse, 130 amp alt., no need to switch it, the fuse is placed close to the battery (preferred) in the trunk and is always hot for the datalogger unless i disconnect the fuse. the battery also acts as a sink for the alt. juice when you shut things down, no reverse spike sort of thing.
then ran pwr lead forward off battery through master disconnect and on to the pwr grid. you could put two masters in tandem and reach your goal i believe.
if you're doing any type efi be careful!
hth
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