just a question, whats a HKE?
as for the tall opponent..I have the same problem. I'm 5'9 and my friend is like 6'3 too so its hard for me to get in. He also has a tactic to always keep running away so its hard for me to gain the inside. So I happen to end up playing a more distant game with him. Like I said, I just ended up throwing some strikes from the outside (playing tag) which I didnt like at all. I got a few good hits on his inside: a couple heavy shots to his chest and a nice chop to his neck.
But I learned that to gain the inside you might have to get hurt, same with takedowns. It might worth it to take a kick/punch and have him end up on the ground.
"you're going to work till you wish you were dead and then keep going.."