Theres a lot of torque through a Bravo leg, as mentioned above its possible the bush on the prop. Send it to Steel Developments to get it fixed.

Other possibility is simply poor loading. Did you have the leg fully trimmed in, trim tabs down ? On cruisers of this size its essential to get weight into the bow to get them on the plane, especially if you are fully loaded -fuel, tender, water etc. Put the crew up front to get the boat going then they can come back out to the cockpit.