I think you look pretty cute as-is.
So really it's a question of how much risk you want to take. To me jaw surgery is a great temptress in that if you have the right plan and everything goes right, sure, you will likely look better. It's all about whether you want to take that gamble. When weighing that risk, make sure not to convince yourself of problems that might arise down the road because they might not, too. You seem to want to do it, though, from what I'm reading. Do you really want to, or is it the allure and mystery of "what if?".
Regarding your case. I now see better why they want to do impaction. Still think it's risky (aging), though, given your short face. Might run into problems with your nose that you're not expecting, too, from the impaction. But technically, yes, that would be the best plan on paper, IMO.