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.
I just changed my Garelick mount to the proper one for my 9.9 Honda. It makes all the difference. Although changing the mount was a real project, my motor now moves in and out of the water with little effort.
We used a Garelick # 302167 Stainless Steel unit that we got at Defender. We were able to use the same block/wedge, we just had to make some minor adjustments by filling in two old holes, and drilling in two news ones in the mount, transom, and backing plate. The base of the mount was slightly wider than the previous unit.
I have a back back, so this was one of the best investments that I ever made using the Admirals money.