I also have this problem with the hull angle. I just got my motor reworked after it had sat for years in the well by the prior owner. I will not be putting my (now expensive) motor back in the motor well. I purchased an outboard motor mount to put on the back. Now to work out the angle problem. I am going to use wood layered for enough thickness to cut a 30 degree angle for mounting to my hull. A stainless plate on the inside of the hull for stability and to make it sturdy. I will be glassing the wood before mounting to the hull. The motor mount of choice can then be added to the wood. The 30 degree angle will give me a straight set up for the motor.
If anyone has a better idea, please let me know soon before I do all this.