12 inch is a lot of setback, usually only use them for bass boats or when the transom interferes with the engine. You ma have to move some weight around in the boat to help balance it. Normally, when you use setback, it allows you to run the engine higher, rule of thumb, every 4 inches back, 1/2 inch up. So with that setback, you need to mount the engine even higher. Good thing is, having the adjustability will make it easier to get the height right. Downside is, the further back you go, the less stern lift you have(does wonders for bow lift) and it may make it harder to get on plane, especially at lower speeds
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