you need to set the bracket according to where the cavitation plate will be in relation to the keel of your boat. I dont know if your bracket is V shaped or straight across on the bottom. On my boat, the cav plate is about 5" higher than the keel, with a 30" setback. My bracket is straight across on the bottom and is a twin engine bracket. The relation to the second step is irrelevant as long as it is above, since the water will flow off the bottom of the hull, not the bottom of the bracket. The bracket for your 30" shaft single engine should be mounted about the same as it was for 25" dual engines.
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