wow, this is a first...
Realistically, that is the best motor for this boat. I am speaking generically, the 9.9 is tailor made for our boats. Like you, the only complaint I have ever heard was about the weight. But, all of the motors in this horsepower range weigh within a spitting distance of the other.
I don't know what the solution is. I know that my Mercury 4 stroke 9.9 is a beast to lift. I don't have the upgraded motor mount though. A new motor mount is on my Christmas list.
Good luck, but you will not be happy with the re-sale value on your motor. Keep it, grin and bear it.
My 2 cents
Ross in Tampa