Re: exceeding transom rating
where are you getting the max weigth for your transom? If my memory serves me well most CG plates state the hp, not the weight. If you boat manufacturer is still in bussines that will be the place to call.
I think your bigger problem will come from the stress put by the motor hp than the actual weight. However, I wonder if 30 lbs will really cause a problem, is seems to be so little difference when you consider the overall weigth of the motor.
If you could state the make/model/year of the boat someone might be able to help you better. I think you are ok, but maybe someone with more experience can set us right.