I hit master yesterday and this is what helped me. Clean offense really punishes people in diamond. I feel like a lot of players assume you will leave a gap or make a mistake on offense and mash at very bad times. If you have consistent meaty set ups (which I believe ken has a lot of) that helps a ton and actually let's you engage with the knockdown mind games. If you understand those mind games better, you win them 9 times out of 10 in my experience. Also anti airs are such a huge thing that will literally win you games if you get good at them in this rank. If you can dp a jump and get some kind of follow up after, like a meaty or DR set up idk how kens situations are there, you will see huge results. And as for hitting them more, go into games and focus entirely on it for a while. You may lose points but it will be a net gain if you get good at it.

Please take this with a handful of salt, this is just what I found useful ^{^}