Hi Duncan,
Glad to hear from you again!! Good news about the boat, cant wait to see it!
I would have to question the need for a wedge - I havent ever seen one used for an Aux bracket??
I think you went for the Samuari didnt you? If so I woudl guess that the transom angle is very similar to the rest of the 'similar' bread, and therefore as a Warrior.
Mine had no wedge, and yes, whilst it sits at a slight angle, when the engine is tilts down on the bracket it is hardly noticable and drives the boat fine.
I would call Seahog just to play safe, but Im 99% confident you wont need one, just bolt on in and away you go - one tip though, I have a small piece of varnished marine ply that has been used inside the transom as a backing plate to take the pressure from the bolts - worth thinking about.
AF