As the shaft down angle increases, you are facing the prop further downward, creating more torque about the Z axis, which causes the boat to want to spin in the opposite direction. Compensating for this wastes thrust. Or in the case of an outboard or a longtail arrangement, it will torque the motor sideways about its pivot. So there is a practical limit to how much down angle you can use. Also, you really do want to keep thrust more horizontal. The downward angle shortens the forward vector. If you want to pick the stern up more, you will need to add some plane surface to the hull aft. Like some trim tabs or something. This of course also increases drag, though. There is no free lunch here. But you can certainly experiment and see if you can find a sweet spot that suits you and your equipment. Just don't expect a miracle.
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