My boat pulls hard to starboard under power also. This is normal and caused by the prop rotation. Pearson offset the prop skeg a bit to compensate for this but under high throttle settings the engine will overcome the offset. Under moderate power settings, perhaps 6.3 kts or so, the boat is neutral. If I push the throttle up to over 7kts, it begins to pull hard to starboard. At 7.8kts, it will overcome the autopilot.