I am a little confused here. You started a thread about a problem you have: kicking the heavy bag with your instep hurts. Dog has no problem kicking a heavy bag with his instep and I believe he has had one or two students in his career that could kick a heavy bag with their instep. He offered one fix, after seeing the video of you kicking. You respond with "I don't care what you think about my form." Thats probably true. But the thing is, its not hurting Dog's instep at all. And, until you make some changes to your kick, it will probably continue to hurt your instep when you kick the bag.
What would help out here, is maybe asking Dog for specifics about what you could change in your kick. He could probably give you some great advice. And, not only would you learn something, but a lot of us other folks on this forum, might learn a few things too. This forum is about people coming together to share what they have learned, but also to learn from other people. If you are going to learn from other people, that means you can't always be the ultimate authority on every subject. Search this forum, you will see many examples of people asking for help or for tips, getting them and reporting back their success. Then they go on to help other people, by spreading what they have learned. There are even folks here who post videos of themselves, and ask for feedback and correction. They take the corrections and tips... and their next video usually shows a lot of improvement.
There are people on this forum who have been teaching people to kick (or do any martial arts technique) longer than either you or I have been alive. There is a great wealth of information here, if you care to take it. If not, hey, its your instep, not mine.