Yep, that's why I said keep your hands up. The good ones are very smooth and agile with feints and head shots. Their combos can be pretty fast, and they can run at you and kick combinations at the same time.
They tend to have a high center of gravity that's shifted towards the back. Check out the lead hip, often it's tilted up and back, and it takes only a relaxed twitch at the hip to shoot a kick at you.
It can be helpful to get under his kicks and lift up and forward with kwa rather than to do a double forearm smash. Kwa is handy against their axe kick. scoop from underneath and slam the kick down and behind you faster than he is kicking. That pulls their balance forward onto their lead leg and gives you their head for hook punch, clothesline, dun pak takedown and similar.
They are not used to grabbing and sweeps to inside of leg. They tend to bounce a lot and have good explosiveness in the calves. Don't waste time bouncing. Just slam some low kicks into his calf to make it hard for him to explode his kicks at you. Nail the upper thigh, both outer and inner.
Don't bother trying to grab any jabs, and don't waste time trying to grab his wrist. If he's wearing a uniform, the sleeve is way better for grabbing. Twist rather and pull on the sleeve and that will lock his wrist and elbow as you go for the head.