In order to lift the rear of the boat more there must be additional
upward pressure that is transferred from the motor to the boat at the
transom. So the simple answer to your question is yes.

But I have never heard of any cases where that additional upward
pressure has caused a transom failure. And imho in a properly
constructed and undamaged boat I do not think the additional upward
pressure would cause any damage. On the other hand if your transom is
rotted then it could be the straw that broke the camel's back :-)

iawia wrote:
I searched for info about hydrofoils that help plane earlier at lower speeds
and learned a lot. But I have one question remaining. Does the hydro put
excess stress on the brackets holding an outboard on the transom? Can anyone
shed light on this? Thanks.