A longer setback on the rudder mount can bring stability to a hull by keeping the bow down, kind of like trim tabs without the drag. As for the actual placement of the rudder in relation to the prop, I have never found a definitive answer. Some small v-bottom boats prefer it closer to the hull, inline with the drive dog, others handle better behind the prop. I don't race my boats, so my only real concern on placement is preventing interference between the rudder and prop, including bent rudders after a crash. Nearly every cat I own has the rudder behind the props, single or twin. Most of my V-bottoms are even or behind.
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