Super confused about how you appear very eloquent and knowledgable on other users’ “chance me” posts yet you portray yourself as a complete newbie here? What are you looking for in a “refined application” when you believe others have the stats and great ECs, can you not use those as examples since you seem to suggest they are a great fit for the schools of their choice? Not exactly sure what you are looking for from your post. If you need a coach to look through your applications, you would have to hire one. Your best private school in the country doesn’t have a guidance counselor to aid you in the process? If you know your friends’ applications are refined, you must have seen them so you can use those for comparison or ask them to help you on your journey.
If you are set on going to school in the States but your grades and ECs aren’t much to show, your chances will be quite slim at the schools you are looking at. As someone else said, cast a wider net if you believe your chances are slim. Be resourceful with your best school in the country and have someone there look through your application face to face as no one here will be able to actually LOOK at your applications and help you refine it.